| re read the article to day and this out lines what is said.
some people in the uk recommend a gdh of as low as 1-2 tests on indoor japanese ponds show readings of between 4-7 this is at the in of the season (march) when the kh was likely to be at its lowest one mud pond was tested as most were still frozen this reading was 3.5 , 1 respected breeder told me he could not get his water hard enough .
if the water is to soft long term it can damage koi as the osmoregularatory system works best in hard water .this is the reason why you always see a lot of oyster shells at breeders.
you can see why people get confused when there are 2 schools of thought.
rick |