milesm;11302 said:
VaughnH;11396 said:If you use a pH test kit, the titration type test kit, where yellow is pH=6 and blue is pH=7.2, then 4 dKH is a great place to be. That makes the pH test kit the most accurate, where you can see small differences in color the easiest. So, 4 degrees KH is a very good number.