Even if it were adding KH, that would only bring pH up, not down. Does anyone have the ingredients list?

Also....epsom salts don't increase KH either. KH is carbonates - i.e. calcium carbonate, sodium bicarbonate, etc. would increase it and possibly affect pH (bringing it up). Epsom salts is magnesium sulfate. The magnesium adds GH since GH measures magnesium and calcium only.