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Endless Nitrite Problem

Getting the water right is fundamental to keeping happy koi. Advice and problems solved.
sdlangford
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Endless Nitrite Problem

Postby sdlangford » Sun Jun 25, 2017 12:23 pm

Good Morning,

I have had my 3600ltr koi pond for ten years.

For the last few years i have been regularly testing the water chemistry.

PH is ok, amonia nil , but Nitrite and Nitrate too high.

I change the water , stopp feeding, nothing works unless i stop feeding for 2 weeks. I got the Nitrite levels to an acceptable level once in Jan, but as soon as a bit of food goes in again the levels go through the roof.

I have tried bacterial boost to the filter, but it makes no difference.

I have added salt, makes no difference, changed food, no difference etc etc.

My filter is a gravity fed system.

I am at a loss.

Whilst the fish are all feeding fine, i alsways seem top loose a fish over the winter period, and i am convinced it is because of the high Nitrite levels.

Should have said earlier, the nitrite is around 0.5 constantly.

Anybody any ideas ? Help !

Simon

sdlangford
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Re: Endless Nitrite Problem

Postby sdlangford » Thu Jul 13, 2017 7:55 pm

Good evening,

No replies to my previous post.

Have tried to keep changing the water but still not getting anywhere with reducing the nitrite.

Few fish looking a bit sorry for themselves now, so really need so help before I lose some fish.

Help.

Simon

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Manky Sanke
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Re: Endless Nitrite Problem

Postby Manky Sanke » Wed Jul 19, 2017 12:35 pm

It goes without saying that the ideal value of nitrite in a koi pond is as near zero as is possible but, in cases where this value temporarily can't be achieved, the maximum tolerable level for nitrite for koi is 0.2 mg/L. Your value is 2½ times that so first priority is to stop feeding and to do water changes until you get the value down below 0.2 mg/L.

After that you can address the problem of why your biofilter is performing so badly but, get the nitrite value down first and we can deal with why the biofilter isn't maturing after that.



Manky

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