Just measured and it went up from 7 to 8 dkH using their recommended formula. Guess I will stick to it by now. Btw, they stated this for their ingredients exactly on bottle: Contains carbonate, bicarbonate, chloride, and sulfate salts of sodium, magnesium, calcium, strontium, and potassium. Maybe thats why the kH doesn't alter the magnesium and calcium because of the added magnesium and calcium etc Sent from Singapore Reef Club mobile app