The Koi pond water quality is really important.Koi fish need to have fresh and clear water.Here is more information about it.

Koi Pond Water Quality
Well water may contain ferrous bicarbonate, detected by a brown precipitate that forms when neutral or alkaline water is aerated. Besides being mildly irritating to the fish, ferrous bicarbonate stains equipment and causes water to become cloudy….

Koi Pond Water Quality
Koi enthusiasts never take their pond water for granted. Just count the number of articles on the web discussing how to keep your water clean enough for your koi. …