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Home: KOI Talk: Pond Construction & Water Filtering System:
No mechanical filter.

 





 


Vincentius Wilianto
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Jul 17, 2001, 11:02 PM

Post #1 of 8 (1263 views)
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No mechanical filter. Can't Post
I have a new pond with volume about 9 tons. There are 4 drains on the bottom of pond which feed the first chamber with water pump. There is no drain in this chamber. The water is pumped to biofilters with consist of bioballs and zeollite. 3 chambers have the same materials. Water flows bottom up. Each chamber has bottom drain for backwashing.

Pond and all chambers are inground.

I realize that I need a pre-filter before water flows to biofilter. What type of filter that is good in my case?

After 1 month the pond filled with water, I see that so many wastes staying in the bottom of pond. It looks like the pump do not pull the wastes into filter. Although the bottom is not flat. What solution on this? Are the wastes dangerous for long term?

Thank you for any comment and suggestion.


dttk
Senior Member

Jul 18, 2001, 12:06 AM

Post #2 of 8 (1263 views)
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Hi, looks like there is a flaw in the design of your filtration system. Pumps should be situated in last chamber so that it would 'pull' water from bottom drain into 1st chamber, then up-down into 2nd chamber, then down-up into 3rd chamber, and so on until it reaches the last chamber and is pumped out again into the pond. The 1st chamber functions as settlement chamber. The 2nd and/or 3rd as biological filters and the 4th is the pump housing chamber. Please give more details about the water flow in each chamber so that we can help to figure out how to help you overcome this problem. Prolonged accumulation of waste at the bottom of pond and drain is not good for fish and water.


Vincentius Wilianto
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Jul 18, 2001, 3:02 AM

Post #3 of 8 (1262 views)
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Water from 1st chamber is pumped trough a pipe inside the wall up down to second chamber. Thus, the water flows down up in second chamber where zeollite put above biobals. The same thing apply for 3rd and 4th chambers. Surface area of biofilters is about 20% of pond's surface area. Water from last chamber flows through small "river" (put some stones here) and fall to pond.

In the first chamber besides main water pump, there is another pump which circulate water in the pond. These pumps are separated by wall, so that the water is not mixed. No bottom drain in these two "half" chambers. To circulate the pond water, inlet is put in the middle of pond's wall and there are 3 outlets located about 2/3 of pond's height.


Khoobg
Webmaster


Jul 18, 2001, 3:25 AM

Post #4 of 8 (1262 views)
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You will need to have a prefilter using brushes or carlnet as filter material. Bio ball and zeolite is definitely not suitable for your biofilter. Try to use green matting for your bio filter and if you wish, you can place the zeolite is the last chamber.

Like dttk has mentioned, pump should preferably be situated in the last chamber. Water must not be pumped to the prefilter as pumping will disturb the waste and make them finer and more difficult to trap.



denniskweh
Koi Lover

Jul 18, 2001, 7:23 AM

Post #5 of 8 (1262 views)
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hi
In my humble opinion, please try not to put zeolite as it has to be maintained (recharged by salf after a few months). If you continue to leave the zeolites inside the pond, it will in fact release more ammonia into the pond making the water quality dangerous for the kois.

Like Khoobg has said, use green matts instead of bio balls in your filter chambers.

regards
Dennis


Vincentius Wilianto
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Jul 18, 2001, 8:28 AM

Post #6 of 8 (1262 views)
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Thanks for the advice. I will replace zeollite with green matting in the near future.

Any suggestion how to clean the bottom of pond?


Khoobg
Webmaster


Jul 18, 2001, 10:45 AM

Post #7 of 8 (1262 views)
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Use a vacuum pump to clear the pond bottom Smile


dttk
Senior Member

Jul 18, 2001, 11:38 PM

Post #8 of 8 (1262 views)
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Hi, thanks for the info. The picture is clearer now. In addition to the suggestions given by Khoo and Dennis, I would like to add something. If it is possible for you to raise your main pump above the bottom drain inlets, you could place some brushes or nets below the pump. These may act as prefilter and will reduce the debris sucked up by the pump. You would still need to vacuum the bottom of the pond and 1st chamber regularly. Hope the above works. Smile

 
 
 



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