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Home: KOI Talk: Pond Water Quality:
100mg/l Nitrates - Please help!

 





 


Anonymous
Anonymous

Mar 4, 2000, 1:54 AM

Post #1 of 8 (2935 views)
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100mg/l Nitrates - Please help! Can't Post
I read many postings at other websites and became aware of this area of nitrates which is usually not discussed. Also I have not found any satisfactory answers to help bring down this level. Can someone help me please.


John Goh
Koi Lover

Mar 4, 2000, 2:21 AM

Post #2 of 8 (2934 views)
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100mg/l Nitrates - Please help! [In reply to] Can't Post
same problem here. As advised from the rest, 20% change of water and dun feed fish for a couple of days. Let the bugs lower the nitrite level first.


cch
Koi Lover

Mar 4, 2000, 1:01 PM

Post #3 of 8 (2934 views)
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100mg/l Nitrates - Please help! [In reply to] Can't Post
Hello,

For outdoor pond, you will really need to vegetation your pond system to absorb nitrate from the water. We plant giant Yam tree that help to reduce nitrate substantially and even is able to keep the water crystal clear when the pond is not shaded.

Peter Waddington has also discussed on the use of trickle filter for indoor pond as a way to reduce nitrate (Refer to Koi Kichi). The trick is of course is to keep the water flow over the trickle filter very slowly so that the process of denitrification can be achieve. This is definitely not an easy task.

Cheers


Lenny Goh
Koi Lover

Mar 7, 2000, 12:20 PM

Post #4 of 8 (2934 views)
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100mg/l Nitrates - Please help! [In reply to] Can't Post
Here is what I did the other day when I found that my NO2 it too high!
I changed approx. 40-50% of pond water with new once (with adding of anti Chlorine) and the next day I found that my NO2 level at 0.25 & the pH went back to 7.6 from 6.2. Could someone please varify this before S.Cummings apply it?
Rgds,
Lenny


dttk
Senior Member

Mar 7, 2000, 1:34 PM

Post #5 of 8 (2934 views)
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100mg/l Nitrates - Please help! [In reply to] Can't Post
Hi everybody, the best and quickest way to bring down nitrate level in pond is by water change but make sure tap water is dechlorinated before doing so. Vegetation too helps in reducing nitrate levels but takes some time. Don't forget that the algae that grows at the sides and floor of the pond also absorb nitrates and hence reducing their level in the pond. Therefore, in a pond where algae and vegetation are not yet well established eventhough the filter has matured, regular water change and no overfeeding is the best way to reduce nitrates. When vegetation and algae are well established later, less water may be changed regularly. Of course we are talking about a matured filter in both these cases because without it, there would not be high nitrate level in the first place. Hope this makes sense.


Doc Conrad
Koi Lover


Mar 15, 2000, 9:44 PM

Post #6 of 8 (2934 views)
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100mg/l Nitrates - Please help! [In reply to] Can't Post
The idea that the water must be so slow over a trickle tower filter has no basis in fact. The water can flow very fast over trickle tower filters, the average residence time of the water in my trickle tower filters is 5 to 10 seconds, and they function extremely well. They are much more powerful than submerged media filters, and can grow the kind of bacteria which convert nitrate to nitrogen gas to automatically self correct the high nitrate problem.


cch
Koi Lover

Mar 16, 2000, 1:17 AM

Post #7 of 8 (2934 views)
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100mg/l Nitrates - Please help! [In reply to] Can't Post
I have infact seen a pond that rely totally on trickle filter and without any submerged biofilter. The pond water quality seem to be fine with koi living happily there.

With the trickle being more effective ways to treating pond water, I just wonder why many of the ponds are built without one and still rely so much on submerge filter [confused]


dttk
Senior Member

Mar 16, 2000, 1:38 AM

Post #8 of 8 (2934 views)
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100mg/l Nitrates - Please help! [In reply to] Can't Post
Dear cch, I agree with you that a trickle tower filter works well as biological filter and also helps to increase oxygenation to the pond. Perhaps some innovative pond builder could camouflage it as a waterfall so that it will blend nicely with the landscaped surroundings because as it is these towers do look slightly out of place in such settings. Let's not forget that the submerged filter also functions as settlement chamber for wastes besides it's biological function. It could also be easily camouflaged.

 
 
 



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