Carbonate hardness (KH), is a measure of the bicarbonate and carbonate content of the water. Carbonate hardness contributes to pH stability and can also act as a CO2 backup reserve if CO2 levels fall too low.
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Carbonate is derived from potassium bicarbonate. It increases both carbonate hardness and potassium. The concentration of carbonate is 2000 meq/L (5600 dKH). In addition, it contains 78,300 mg/L of potassium.