Ok, that was what I was getting to, was the daily demand/loss do cl that could be expected. There was an algae bloom when we first moved in 6 weeks ago, but that cleared up with initial treatment. Water has gained clarity steadily, and looks great now, but maybe the residual of that bloom and the heat here increased the demand quite a bit. Are the hth shocks ( sodium hypochlorite) better for me with presumed high cya than dichlor?