Api Carbonate Hardness Kit Kh Test - Fresh/salt

CARBONATE HARDNESS) Tests tap water and fresh or saltwater aquariums for carbonate hardness(KH), the measure of dissolved carbonate and bicarbonate ion concentrations, also called alkalinity. * For fresh & salt water * Helps detect stress on fish caused by rapid pH shifts, the result of low levels of KH * Helps to maintain the correct buffering capacity in aquariums. 1 Bottle Kit.