Tetra pH/KH Plus for the optimum adjustment of pH and carbonate hardness levels. TetraAqua pH/KH Plus allows the carbonate hardness and pH value to be precisely adjusted to planned or recommended levels. It is a very safe, reliable and simple application. pH/KH Plus compensates for carbonate hardness losses in marine aquaria and carbonate hardness losses that frequently occur in densely populated tanks. For the acute treatment in the event of a sudden drop in acidity Tetra pH/KH Plus is also suitable.Application Tetra pH/KH Plus:5 ml per 20 litres of aquarium waters increase the carbonate-hardness (KH) about approx. 1 degrees dKH. For both freshwater and marine water aquaria.