I recently purchased some jacks magic purple stuff to control some pool scaling, anyone have a particular way of using it aside from the recommended details on the bottle. It practically asks to put the whole 32oz bottle in then weekly add about 6 oz. also, at what point do you start draining pool to control calcium hardness. My current test results are as follows, FC 5, cya about 70, ph 7.4-7.6( fluctuates daily but I keep it at this level), ta 70-80, ch 500.