Janet, thanks so much for the very detailed response. I shut the chlorinator off by setting it to zero. Unfortunately, I can't drain any water, as we are currently on water restrictions because of lack of rain, and our water usage is closely monitered. Therefore, large amounts of bleach is my only option for another month or so; I have 12 gallons of 6% on hand. Since I don't need the CYA, I should be able to exchange it for liquid chlorine.

Temperature is still in the mid to high 90's, we should have another six weeks or so before I cover the pool.

Calcium. Our subdivision has community well water managed by a local water company. I just received their annual report listing contaminants and constituents; the reports shows the calcium ppm is 108. And, of course, I did put in about 20 lbs of cal-hypo in the past week.

So, if I understand you earlier response correctly, I need to add 7.5 gals of bleach, monitor morning and evening, and add 1 quart of bleach as need to maintain a shock level of 25-30ppm until I no longer lose chlorine and CC is 0.5 or less.

I have four new filter cartdriges to change out, but I assume it is best for me wait until I get the algae under control.

Thanks much,

Jim