What Is Gh, And Kh?

[dcj38]

What is GH, and KH, and what do they do?

 

[@ombomb]

http/www.fishforums.net/index.php?showtopic=59467

 

[cujoho78]

GH is general hardness which is a measure of the calcium and magnesium in the water. KH is carbonate hardness or alkalinity which is what keeps the pH from changing. Have a look at this site http/www.thetropicaltank.co.uk/wchem.htm in the water hardness section for more explicit information.