Barrs GH Booster ups kH? Because Ca, Mg and Potasium only ups GH for KH only a few teaspoons of baking soda and you have a good up of kH and pH. Still if you like the low kH and GH (for soft water plants) you have the perfect water. Is more difficult to mantain as you see but for me its a privilege, in my house pH dont down from 7.6 - 8.0!!!