Let 650g system get 11liters saturated kakwasser a day. Then 140 ml of brs soda ash solution. The rest o the demand is met by a tunze automat calium reactor during daytime when alk demand peaks. I am able to maintain alk sharp at 8.4 and ph between 8.05 and 8.33. Calcium reactor has a second chamber. Eve with that, you can expect a .1 drop in Ph.