Thread: Water problems advice please

I’ve had my pond running for around 6 months now and started to encounter problems mainly Ammonia which has me worried, koi have flashed a little.

Last week I was doing partial water changes everyday at around 20% and it has brought it down a little, always de chlorinated.

I’ve tested my water again today with the following results.

Ammonia 0.2
Nitrite 0
Nitrate 10.0
PH 7.5
KH 4 drops
GH 7 Drops


5000 litre pond, 6 Koi.
Filtration 4” bottom drain to eazypod, varipump, 25watt UV, large waterfall return box with mountin tree spiral filter matting and lotus root inside.

I’m worried for the koi and wondering if I’m going overboard with water changes.

Help much appreciated.


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Hi Alburglar.

Thanks for your reply.

I was worried nitrate might have been too high.

I did another test today and the only difference is no Ammonia which is good but nitrate still at 10

Weirdly enough I tested nitrate alone with another testing kit from a different brand and it was showing 0 nitrate.

I’ve seen no flashing today thankfully, and yes I’ve done scrapes and de chlorinated


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Unheated yes and stopped feeding


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Perfect thank you for the advice


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