Home: KOI Talk: Pond Construction & Water Filtering System:
Why call dry/wet if dry is better?



cometress
Novice

Sep 17, 2002, 7:08 AM


Views: 68753
Why call dry/wet if dry is better?

After reading widely on the different types of flitration system, it appears that the trickling tower (TT) filled with bio balls is considered the best amongst all other systems to nitrify bacterias, because this syetm allows water to drip slowly through many layers of porous materails (bio balls) in a highly oxygenated environment. This TT somehow also commonly known as dry/wet system, intrigues me to examine their set-up whenever I pass by fish shops.

Most of the set-ups of such towers has the top half trickling with water and the bottom half submerged with water. So I have several questions:

1) If trickling is so effective, why they allow the bottom half to submerge with water which is erected just besides a sump which draws water back to the tank using a power head. Isn't letting the bio balls half submerge will render this system less effcetive? (The bottom level of the tower and sump are on the same plane for this case).

2) Why don't they simply erect the tower above the sump and allow all bio balls to receieve the trickling effect, thus becomes a totally dry system? OK, for commercial reason, maybe lack of space but have seen many shops are doing the same as described in (1).

3) So I ask the salesmen but none can give me a convincing answer. However, one told me we need the dry and wet to handle all different kinds of bacterials. This is perhaps the nearest convincing answer I got.

Any expert willing to elaborate?Angelic


johnson lee
Veteran

Sep 17, 2002, 8:14 AM


Views: 68704
Re: [cometress] Why call dry/wet if dry is better?

Hi there again!Wink

The principle of a TT filter is that when water with nitrates trickles through the air and pass the bio-balls, nitrates is converted into nitrous oxide. Hence, the water going back into the pond contains very little or totally no traces of nitrates anymore. The effectiveness is the water trickling down a height of at least 12" before reaching the media. If you have a number of trays containing bio-balls, the water will still be trickling pass a dry environment until it reaches the last tray which carries the water back into the pond.

So, it doesn't matter whether the last part of the TT filter is submerged or not, the effectiveness is at the beginning of the trickle up to the next few trays of bio-balls. However, having said that, I am puzzled why should the koi keeper submerge part of the TT filter in water? It should be free standing and the last tray will flow back into the pond!

I hope this makes sense to you.

Johnson



cometress
Novice

Sep 17, 2002, 9:02 AM


Views: 68699
Re: [johnson lee] Why call dry/wet if dry is better?

Thanks.

I read somewhere in this forum that it has to be a height of 3' for any effectiveness, whereas you mention a min. of 1'. Is there any scientific write up on this? Sorry, I'm not doubting you but I'm really keen to keep track on this. Smile


johnson lee
Veteran

Sep 17, 2002, 9:14 AM


Views: 68696
Re: [cometress] Why call dry/wet if dry is better?

Errr....sorry no scientific and empirical evidence on this.Crazy Just through trial and error and experimenting.

If you have a height of 3' between the trickle and the media, you must make a rather tall TT filter! I believe a minimum of 1' is sufficient. Just my opinion.Smile

Johnson


cometress
Novice

Sep 17, 2002, 4:56 PM


Views: 68681
Re: [johnson lee] Why call dry/wet if dry is better?

Johnson Lee,

Thanks for the prompt reply. Happy ponding.Sly


johnson lee
Veteran

Sep 18, 2002, 6:26 AM


Views: 68667
Re: [cometress] Why call dry/wet if dry is better?

You're welcome and hope to see you more often on this forum!Smile

Johnson


SMW1
Veteran

Sep 18, 2002, 9:46 AM


Views: 68664
Re: [cometress] Why call dry/wet if dry is better?

Any size TT is better than none at all Crazy.

However tall and thin is better than short and fat. The more media the water passes over during the filtration process of the TT the more nitrates are removed. Size is totally dependant on the amount of Nitrates you want to remove. i.e. a bigger pond with no vegitation will requie much taller TT than a small pond with lots of plants, which will probably need a very small one if at all.


jitwee
User

Sep 18, 2002, 5:37 PM


Views: 68653
Re: [SMW1] Why call dry/wet if dry is better?

Hi guys,

I needed some advise from you all. I have a TT system at my last chamber. Meaning part of the water is being pumped back to my main tank and the rest is to my TT. I have being adjusting the flow rate to my TT for a few weeks but the result of my NO3 don't seem to drop ( maintain at 50ppm).

My TT dimension are :
Diameter of PVC pipe : 7 inch
Height of the TT : 32 inch inclusive of elbow.
Height of the bio ball : 20 inch
Water trickle from the pipe to bio ball : 8 inch

Is there any thing wrong with my TT setup or i still needed to wait for a while for my TT to kick in ?
If i were to look for a individual pump for my TT, what flow rate must i buy ?
Does it mean that the lesser we feed the level of the Ammonia,NO2 and NO3 will also drop since they are all link together?

Sorry for so much question,still very new to this hobbyBlush


SMW1
Veteran

Sep 18, 2002, 6:54 PM


Views: 68646
Re: [jitwee] Why call dry/wet if dry is better?

Hi, The size of the TT and the effect it has deends on the volume of water yor pond is holding and the stock level.

What size is your pond ?.

Yes feeding less means less polution. Fish waste and rotting excess food will produce ammonia, nitrosomonas consumes ammonia producing nitrite, nitrobacter consumes nitrites producing nitrates. So if you feed less you produce less ammonia, therefore these nitro guys don't have to work so hard - simple Crazy


johnson lee
Veteran

Sep 19, 2002, 5:21 AM


Views: 68636
Re: [jitwee] Why call dry/wet if dry is better?

Hi Jitwee

Your TT dimensions seemed fine to me. But it would be better if you can adjust to have the distance netween the trickle and the bio-balls to at least 1'. Give it a little more time and nitrates should start reducing. Of course, the less you feed , the less work your good bugs will have.

Moderation is the best policy, I'll say!Smile Best wishes.

Johnson


jitwee
User

Sep 20, 2002, 2:18 AM


Views: 68621
Re: [johnson lee] Why call dry/wet if dry is better?

Thanks for your advise,

If my trickle distance to my bio ball increase to 1 feet,this means that the height of the bio ball will reduced to 1.5 feet. Is it ok to reduced the number of bio ball?

Can i increase the good bug by adding those liquid/power solution which is avaible in the store ?

I did a partion change of water every 2 days, will this kill away the good bugs (anti chlorine is added).

Regards,
jitwee


johnson lee
Veteran

Sep 20, 2002, 5:57 AM


Views: 68616
Re: [jitwee] Why call dry/wet if dry is better?

Er...you still need to have a certain a amount of bioballs for the TT to be effective.

No need to add the bio-liquid to your TT. You can add that in your bio chamber to speed up the production of the good bugs.

Partial water change using anti-chlorine will not kill your good bugs.Smile


SMW1
Veteran

Sep 20, 2002, 9:28 AM


Views: 68608
Re: [johnson lee] Why call dry/wet if dry is better?

I'm a little confused Crazy.

What's so important about the distance between the trickle and the bio balls Unsure ?

I can not understand what difference this makes to the conversion of nitrates.Unimpressed


johnson lee
Veteran

Sep 20, 2002, 9:49 AM


Views: 68606
Re: [SMW1] Why call dry/wet if dry is better?

Hi Stuart

From the little that I know about TT filters, most people using TT filters agree that the distance between the trickle to the bio-balls is important because as the water trickles down, it mixes with O2 along the way which then converts it into nitrous oxide (hence the reduction of the nitrates) and then as it trickles into/onto the bio-balls, the remaining nitrates are also oxidised by the O2 in and around the bio media.

Otherwise, I can't see how the good bugs can thrive in a TT filter when not much of the media gets wet.

I know what you will ask me next: If that is my theory, why the need for bio-balls, might as well just let the trickling water trickle down over a longer distance? I really do not know the actual principle behind the TT but just that it works. Sifu Mark also mentioned that the slow trickle and height do make a difference.

What are your thoughts on this?

Johnson


SMW1
Veteran

Sep 20, 2002, 12:36 PM


Views: 68602
Re: [johnson lee] Why call dry/wet if dry is better?

Johnson



You read my mind Johnston, that is the question I would have asked next. I was only wondering because my TT is 4' hight but only had about 4" between the inlet pipe (which is drilled will about 28 x 8mm holes, and the flocor (had lots of flocor left so I used this instead of bio balls). However since I built the TT within a month the Nitrites went from 0.15 to 0 and the nitrates went from 75 ppm to 15ppm. So I guess it's still working. I will open it up shortly and remove about 8" of bio balls from the top layer and see if it makes much of a difference.

Thanks for the explanation.

Stuart



cwnchong
Koi Kichi

Sep 20, 2002, 1:07 PM


Views: 68600
Re: [SMW1] Why call dry/wet if dry is better?

Struat,

By the way what is flocor?


SMW1
Veteran

Sep 20, 2002, 4:16 PM


Views: 68597
Re: [cwnchong] Why call dry/wet if dry is better?

Flocor is a media which is designed to accomidate the good bacteria. It is hollow to allow good air/water flow and has ridges all around it. It's about a quarter of the price of Japenese matting and about half the price of Bio Balls.


jitwee
User

Sep 20, 2002, 6:16 PM


Views: 68592
Re: [SMW1] Why call dry/wet if dry is better?

Hi SMW1,

The flocor seems like a type of wire protector that used in my company (protecting and decoration purpose). Don't know if it is the same? But it look the same to meCrazyCrazyCrazy.

I have adjusted the height of the water trickle from my pipe to the bio ball (Reduced the amt. of bio ball ). Let's see does it really make a different.......
The immediate impact is 'Noisey' cause water is hiiting at the bio ball at a greater height.


Regards,
jitwee


SMW1
Veteran

Sep 20, 2002, 11:13 PM


Views: 68588
Re: [jitwee] Why call dry/wet if dry is better?

It could well be.

We can use quite a lot of everyday items as media. Look at hair rollers for instance. Laugh


dttk
Veteran

Sep 21, 2002, 8:01 AM


Views: 68578
Re: [johnson lee] Why call dry/wet if dry is better?

Johnson Sly, I'm still doubtful about the nitrates being removed by oxygenation alone and not by oxygen-loving bacteria. If oxygen alone is effective in removing nitrates, then there is no need for biomedia. A thin curtain of nitrate rich water would have been sufficient. Also, I think that if we could get as many bioballs wet from the onset, then there is no need for a certain height between the spraybar and the bioballs Wink. Any comments Sly.
Always friendly :)


SMW1
Veteran

Sep 21, 2002, 10:10 PM


Views: 68566
Re: [dttk] Why call dry/wet if dry is better?

This was my thought exactly.

I know that at least 95% of my bio media gets wet within my TT. I use a 2 inch pipe with many holes that will cover the entire surface (top level with water, the way it is positioned). As I mentioned in a previous post I only have a small amount of space between the media and the pipe.

Maybe the rule of thumb that the media should be a certain distance between the inlet has something to do with the way the water is dispersed on entry to the TT.


johnson lee
Veteran

Sep 23, 2002, 7:19 AM


Views: 68546
Re: [dttk] Why call dry/wet if dry is better?

Good afternoon Dr Tan

Thanks for your input!Smile I am still puzzled by the principles behind the workings of a TT filter actually. It's good that we are having a discussion on this. I have been stumped by some of the questions posed by friends, forum members etc. All I know is that it works!Sly

I'm sure you're right in that it takes more than oxygen to remove the nitrates but I did remember reading somewhere that O2 plays a vital role in assisting the conversion of the nitrates into nitrous oxide.

Seems like I have more questions than answers now!WinkFrown

1. We say that the slower the trickle the more effective the TT filter is. But if the trickle is slow, doesn't it mean that the bio-media doesn't have the chance of getting wet. Water just trickles pass and the media will not get really wet, hence how will the bugs survive? Even as both Dr Tan and Stuart have the trickle well spread out, but due to the slow trickle, I'm not sure if the bacs. survive there well.

2. Eddie Lee posed me this question which stumped me. "If you had a very large pond like say, Dr Tan's, assuming there are lots of nitrates in the pond, how will a small TT filter running at such a slow trickle be able to convert all the nitrates and how long does it take for the water to run through entirely once by the TT's pump? I didn't know how to answer that!Unsure

3. If I remember correctly, Mark Richman did some tests on this and his conclusion was that height and the slower trickle do make a difference to the results.

I too have the same thoughts like Dr Tan and Stuart, but wanted to push this discussion into a different realm by inviting more views on this. Anyone care to contribute their thoughts?Sly

Johnson


SMW1
Veteran

Sep 23, 2002, 9:43 AM


Views: 68543
Re: [johnson lee] Why call dry/wet if dry is better?

This is turning into a very interesting subject once again.

My TT does not really trickle. I guess I would grade it somewhere in the middle of a trickle and a spray. The turnover is quite high, I'm not saying that the water floods out at 1000 gph, but it doesn't trickle out.

With regards to the Nitrates and how exactly they get converted into Nitros Oxide. I do believe that it has to do with the oxygen probably a little more than the bacteria. The reason I say this is ~I have two examples or filters or media that also reduce Nitrates.

Turbo Cleaner - This is supposed to reduce both Nitrires and Nitrates. Although this is claimed by the makers. I personally do not see much difference without the device on, I'm not saying there isn't difference, only that I can not see it.

K1 - This new media is supposed to reduce Nitrates, If used correctly i.e. agressive airation.

What do they doth have in common with the TT ?.

They both use a lot of oxygen. The Turbo Cleaner uses a bubble method and the K1 uses airstones.


johnson lee
Veteran

Sep 23, 2002, 9:55 AM


Views: 68541
Re: [SMW1] Why call dry/wet if dry is better?

Hmmmm....Stuart, interesting food for thought!Cool Must do more research.....Wink


dttk
Veteran

Sep 23, 2002, 3:53 PM


Views: 68536
Re: [johnson lee] Why call dry/wet if dry is better?

Hi Johnson, Stuart, Eddie Smile, Yes,...yummy....this is turning out to be better than I thought! Laugh. Let's answer Eddie's question to Johnson first. I do not depend much on my small TT to reduce nitrates. This is well taken care of by the algae on the walls and my plants! Cool. My single TT is not able to handle all the nitrates that is produced but it is doing it's small bit of reducing nitrate by constantly working 24hrs a day(... like who's isn't...Crazy). Let's just say that it is "helping" my plants to reduce nitrates too. If I did not have plants at all, I would probably need 10 of such TT's to do the job of reducing the nitrate to a decent level as now, abt 40ppm. So Eddie, don't look at my TT too seriously...Laugh. Why did I build it? It was fun and it was an experiment. Can be improved upon as far as the water distribution to the bioballs is concerned...Crazy.

As Stuart mentioned, by slow trickle I don't mean ve...ry sl...ow Laugh. Water should trickle on as many bioballs as possible to keep them wet but not splash on them. In fact there will be more oxygenation of water this way than splashing. Perhaps we should get some confirmation from those people who splashes water on their bioballs to see if that works better. Most importantly, fresh O2 should be able to enter the TT in sufficient amounts. I really do not know if a bacteria exist that removes nitrate Unimpressed. Even if it doesn't, the height of the TT and the trickling of water has shown to be effective in removing nitrates. Sly
Always friendly :)


jitwee
User

Sep 25, 2002, 7:19 AM


Views: 38280
Re: [dttk] Why call dry/wet if dry is better?

Hi to everyboby,Smile

After increasing and reducing the height of the bio-ball,i don't find any different. The result is still 50ppm. Ialso play around with the flow rate to my TT,the different isn't that much too. My this set up is water splashing/flow down direct to the bio-ball. I let the system run for 2 days,result is the same,reading did not go downCrazyMadFrown. Infact this system have been running for a month but at this moment i'm playing with the height/number of bio ball.

I then change my set. My 2nd setup is not letting the water to splash or flow direct to the bio ball instead water is evenly distributed and trickle down. Within 1 day the result of the NO3 drop. Till today the reading is below 10ppmSlyLaughWink.

Throught weeks of experiment,i find the main trick of the TT system is to let the water evenly distributed and let it trickle down to the bio ball. The best is to cover as many bio ball as possible. I believe that as water is flow down to the bio ball,it is being mixed with the surrounding air.As it flow further down it is being further broken down to smaller droplets of water. The is why i think that the higher the TT and the more bio ball is better. As for the flow rate, there isn't much impact at my system.
My this present TT is able to handle my tank even it is overcrowded. Please correct my findings if i'm,i'm still learning......Blush

I hope my this small experiment can contribute.BlushBlushBlush


dttk
Veteran

Sep 25, 2002, 9:55 AM


Views: 38271
Re: [jitwee] Why call dry/wet if dry is better?

Good for you, Jitwee Sly. Btw how large is your tank? The smaller it is, the faster you would see the results. I agree with you that even distribution to cover as many bioballs as possible is important and the water should not flow too fast to form thick columns of water. Instead it should form thin columns so that maximum oxygenation is achieved. Cheers! Smile
Always friendly :)


SMW1
Veteran

Sep 25, 2002, 10:18 AM


Views: 38269
Re: [jitwee] Why call dry/wet if dry is better?

Nice one Jitwee, you saved me the time and effort. I was going to do a little experiment with the distance between bio and inlet as I was convinced that it made no difference.

I think that the difference between a true trickle i.e. something silly like 5 gph and what I have at 300 gph will not really matter. However if you decided to go with 2,500 gph I think this will have a big effect and the TT will fail to function correctly. But then I don't suppose anyone has tried this volume so again it's open to the critics.


jitwee
User

Sep 25, 2002, 10:37 AM


Views: 38264
Re: [dttk] Why call dry/wet if dry is better?

Hi dttk,

My tank is about 2 tonne and it is over crowded with 9 koi avg 42cm and 2 koi avg 15cm. Staying in HDB,have no space for big tank.Cool
By the way is it true that most of the koi hobbist uses a hi-blow for their tank/pond. Consider to get a hi blow 40.Presentlt using 2 normal air pump.

Regards,
jitwee


SMW1
Veteran

Sep 25, 2002, 10:55 AM


Views: 38262
Re: [jitwee] Why call dry/wet if dry is better?

I think that al koi pond oweners should posses an air pump. Hi Blow are one of the best but there are quite a few cheaper models around. Blagdon do a range of KA40, KA50 or KA65 called Koi air. These are quite cheap but very good.

I have had a KA50 running on a timer for about 2 years now.


SMW1
Veteran

Sep 25, 2002, 11:05 AM


Views: 38260
Re: [jitwee] Why call dry/wet if dry is better?

Sorry, It may have been a good idea to tell you why they are so good.

A few air stones in the pond itself will populate the pond with oxygen, it also gives the koi's something to do. My koi love to play in the bubble now and then, they can also use it to clean themselves.

A few air stones in your filter increases the growth of nitrosomonas, nitrobacter and maybe even heterptroph. Which as we know together remove Ammonia, Nitrite and Nitrates. Air stones in the filter also discourage the anaerobic bacteria from growing.



jsoon
User

Sep 25, 2002, 6:13 PM


Views: 38251
Re: [SMW1] Why call dry/wet if dry is better?

Jit Wee,

I think you can utilised your air-pump better. You have 2 pumps. You can channel one pump to the filter box. Put some air stones in your filter above the filter matt to provide oxygen for the bacteria. Then maybe, you can consider getting another auxilary pump to provide for the main tank air pump.

Hi-blow pump is very good. I nearly sold off one when Eric told me that the pump can last for many years and later change my mind about it. I am using hi-blow 20 which is the smallest. It consume about 17W.

You have to decide if you really want to go for Hi-blow. Hi-Blow 40 means that it can support up to 40 air-stones, (someone told me). The cost is about S$240 and this powerful giant consumes 37W.

For that air output to the ratio of your tank size, the air-bubble generated can "blur" your water and you may not see your Kois from the top at all not unless you control the air outlet or channel them to different air stones.

For me, instead of buying one more Hi-blow pump, I bought one AC-DC pump and it can switch over to battery mode when the electrical power fails.

Accordingly to the manufacturer, it claim that the pump can provide 8 HOURS of battery life to the pump.

The pump use only 8W and has 2 outlet but personally, I find it just enough to cater for a disaster need. The cost is about S$50 for the pump. The brand is HAILEA.


Think about it....


jitwee
User

Sep 25, 2002, 6:50 PM


Views: 38249
Re: [jsoon] Why call dry/wet if dry is better?

Hi jsoon and SMW1,

Thanks for your advises.CoolCoolCool
In this case i think that a hi-blow 20 is more sutible for me considerating it is operated at 17W.


dttk
Veteran

Sep 26, 2002, 5:03 AM


Views: 38241
Re: [jitwee] Why call dry/wet if dry is better?

Jitwee Smile, there you go! Stuart and jsoon have given some excellent info...Wink. I think a Hiblow 20 is sufficiently good for your koi too.Smile
Always friendly :)


johnson lee
Veteran

Sep 26, 2002, 6:25 AM


Views: 38237
Re: [jitwee] Why call dry/wet if dry is better?

Hi JItwee

Good to hear of your experiments with the TT!Smile I am a little confused though! You mentioned that your 1st experiments with different height and flowrates did not make much of a difference but then when you switched to a uniform flow of trickle over all the bio-balls it worked wonders for you right? At the end you concluded that height does make a difference but the water must trickle evenly/uniformly. Am I getting you right there?

If so, then you are not at all far from my thoughts!Wink I have mentioned that the height between the bio-balls and the trickle makes a difference. I did not mention that for a TT filter to work well, you need to have very even spread of the trickling water. That's what I have with my TT filter.

I may be wrong, but apart from the even flow, I still believe that height plays a significant difference.


jitwee
User

Sep 27, 2002, 6:49 PM


Views: 38217
Re: [johnson lee] Why call dry/wet if dry is better?

Hi johnson,

Thanks for remainding meBlush. I did say that the height does make a different. The height i'm referring to is the height of the bio ball.The taller the height of the bio ball colume means that there are a lot of bio ball in the TT system.The short the bio ball colume meaning the amt of bio ball is lesser. So in this case I'm refering to the more the bio ball the better it is.

The large amt of bio ball will further break down the water flowing throught the TT to even smaller droplets. They will also provide even more space for the good buds to grow/stay/hide. As for my second set up,i have increased the amt of bio ball/height of bioball almost to the top.

As for the dist between the trickle to the bio ball, i have yet to try out. Hope to try out the different between them once i'm free...WinkCoolLaugh.At this moment i'm still closely monitoring the reading of the NO3,still trying out the different between heavy feeding and normal feeding....See which of the parameter will affect the most (NH3/NH4,NO2 or NO3).Of this is only for a short period.Cool This will allow me to understand the nitrogen flow even better.

Regards,
jitwee


johnson lee
Veteran

Sep 30, 2002, 5:58 AM


Views: 38205
Re: [jitwee] Why call dry/wet if dry is better?

Hello JW

Thanks for the clarification!Smile Yes, it is true that the more bio-balls in a taller container will allow more time for the water to trickle down to the bottom thus allowing more oxidising of the nitrates by the O2 and good bugs!

Look forward to hear about your continued experiments. Pls let us know the results as soon as you have them.

Rgds

Johnson


patrick123
Veteran


Sep 30, 2002, 11:40 AM


Views: 38196
Re: [jsoon] Why call dry/wet if dry is better?

Do anyone know if Hiblow can be used outdoor and explose to rain and shine?

Cheers,
Patrick


johnson lee
Veteran

Sep 30, 2002, 11:51 AM


Views: 38195
Re: [patrick123] Why call dry/wet if dry is better?

Hi Patrick

Hiblow is best kept indoors and away from the rain and sunshine. Rain may cause the electronic circuit to go haywire and too much heat on the hiblow may also shorten its lifespan. If you need to place outdoors for obvious reasons, place on top of 2 bricks and provide shade for it and try not to get it wet. Just my suggestions.Smile


jitwee
User

Sep 30, 2002, 12:21 PM


Views: 38189
Re: [patrick123] Why call dry/wet if dry is better?

Hi patrick,

How are you?Cool
Johson is right about that.I have just bought a Hi-Blow for my tank. There are some warning outside the pump.One of the warning is 'Not to place the pump where it might come contact with liquid'.If you were to place a Hi Blow outside your house,it is good to have shade or shelter above it.Sly
I'm looking for a long air tube but prefer not make of stone.Some thing that produced fine bubble.Does anyone have recommdationCrazy? Thanks.

Regards,
jitwee


patrick123
Veteran


Sep 30, 2002, 12:39 PM


Views: 38182
Re: [jitwee] Why call dry/wet if dry is better?

Jitwee,

Good to hear from you. In Thailand, I can find a kind of air tube that is flexible and black in color. This is probably what you are looking for. Not too expensive. 1 ft flexible tube is round S$10. My problem is that the tube seems to comsume a lot of "air" from the compressor. When I connect the compressor to an air stone, I can see the air pressure is very strong, but when I connect to the black tube, the bubble is very light. I suspect is because I have not soaked the tube in water long enough.

I believe you should be able to find it in Singapore too.

Cheers,
Patrick


jsoon
User

Sep 30, 2002, 5:28 PM


Views: 38178
Re: [patrick123] Why call dry/wet if dry is better?

Jit Wee,

Which Hi-blow did you buy and how much roughly you paid for it ?

If you want a flexible tube, someone bought this black tube about 1" in diameter and it help to produce a lot of bubbles. The tube is connected to a Eheim 1" tube to the pump. The person got it from rainbow.

Patrick, I think the black flexible tube you are refering to is sold in Local Fish Shop (LFS). I got one too and is not very good as what you describe. There is another better one which I mentioned above and I seen it and is much better.

Patrick, I have not come across any air pump that is meant for outdoor. If there is one, I won't be surprise how expensive it will be.

There is some alternative. Either use a venturi with a pump or you built a small housing (like a dog kennel) to house your air pumps etc.


jitwee
User

Oct 1, 2002, 4:00 AM


Views: 38173
Re: [jsoon] Why call dry/wet if dry is better?

To patrick,

i have 2 of those inside my tank at the moment. The air pump you are using is not strong enough to drive the flexible air tube.I have this problem too when i'm using the normal air pump.Using a high blow is not a problem.Smile

To jsoon,

I'm a bit K.S, i bought the HB 40.The reason is as time goes by i will increase my stock (sometime just can't control), therefore many O2 is needed. Once and for all,go for the HB 40. I'm paying $200 and the HB 20 is $150(petmart). Some place are selling $250 to $280 for the HB 40......
You are right that the bubble will burr the surface water (using normal also the same) but i only spent some time seeing them swim, so is ok.I would like them to enjoy as much O2 as possibleWinkWinkWink if i can afford.The different betwween the operating cost for the HB 20 and 40 are $2.15 and $4.67 (operating at 24hrs for 31days).Not so bad lah.
I'll go to take a look at the air tube once i'm free....

Cheers
jitwee


patrick123
Veteran


Oct 1, 2002, 6:25 AM


Views: 38166
Re: [jitwee] Why call dry/wet if dry is better?

jitwee,

Just so that I'm not missing something. Since you already have 2 of those black tubes in your tank and they work ok according to your post. Why are you still sourcing for more air tube?

Cheers,
Patrick


jitwee
User

Oct 1, 2002, 10:55 AM


Views: 38159
Re: [patrick123] Why call dry/wet if dry is better?

Patrick,

I have 6 outlet at my pump. 2 inside my bio chamber, 2 inside my tank and 2 inside my last chamber (where my pump is). Try to put one more to my main tank.

Just a question to all. If i put the air stone at my last chamber,will it supply O2 to my main tank since my pump is at my last chmaber pumping the water to my main tank CrazyCrazy? I do intend to post this question at the 'General discussion' for more answer.SlyCool

Cheers,
jitwee


dttk
Veteran

Oct 1, 2002, 3:17 PM


Views: 38145
Re: [jsoon] Why call dry/wet if dry is better?

Jsoon, my Hiblow 40 is located outdoors. Eventhough it is under the pergola, it does get a fair share of direct sunlight and rain. No problem so far as it is entering it's 2nd year of operation. I think a pump like the Hiblow is safe to be kept outdoors too. Smile
Always friendly :)


jsoon
User

Oct 1, 2002, 5:54 PM


Views: 38136
Re: [dttk] Why call dry/wet if dry is better?

Dr Tan,

That was a great insight. Thanks


slim
User

Oct 2, 2002, 5:46 AM


Views: 38123
Re: [jsoon] Why call dry/wet if dry is better?

I installed mine outdoor too. However I cover it with a terracotta pot not because of the rain but to prevent it from being stolen as its just next to my fence. Sly It cost me Rm850 for Hiblow 80! BTW mine is located below my pond water level, and I have to make 'n' shape pipe with the top raising 2feet above the water level to prevent water from flowing back into the pump if there is a power failure.


wan
User

Oct 2, 2002, 9:13 AM


Views: 38118
Re: [slim] Why call dry/wet if dry is better?

I have a Hiblow 40 installed under the timber deck of the Pergola. So far mo problem with the rain or shine.