We have all heard the much overused cliche “take care of the water and the fish will take care of themselves.” or “fish keeping is all about keeping water” and so on. Well there is a lot of truth in those sayings and there are huge amount of problems that develop in a Koi ponds that could easily be avoided by improving water conditions and reducing stress in the fish.
It’s all well and good just to assume that everything is ok with the water because everything appears to be ok with the fish and it has always been ok. But that view is naive at best. Sooner or later something will change and a problem will ensue.The only way to know the state of the water is to test it with a proper test kit.
A basic set of Kits must include tests for pH, Ammonia and nitrite. There are many more kits available but these are the main ones you need to be checking on a typical Koi pond.
If you would like to learn more I made a YouTube video about why water testing matters.