Fritz KH Alkalinity Test Kit Algae Control after a water change

after a water change

just as with nitrite testing

according to your needs

nitrification is completely inhibited below pH 6

magnesium oxide

Fritz KH Alkalinity Test Kit Algae Control after a water changeFritz Liquid Test Kits Alkalinity East to Read Instructions Essential for a Healthy Tank Accurate in both Fresh and Saltwater About Fritz Liquid Test Kits Alkalinity Carbonate hardness, or alkalinity (KH), is the measure of both carbonates and bicarbonates present in the water. The KH value of your water is important to know, as the carbonate hardness plays a significant role in the waters pH and the waters buffering capacity to keep that pH stable.