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REKHARB is a liquid KH booster. This fertilizer has been specifically formulated to safely increase carbonate hardness (KH) in planted tanks.
Follow the dosing instructions provided with our KH booster to get the desired effect from this fertilizer.
1 pump(2ml) per 4 gallons raises KH 2.8 degrees(1meg/l) and adds 40ppm(mg/l) potassium. A KH of 3-6 degrees is suggested.