Thanks everyone for the replies. And, Richard, as always your in depth knowledge reigns supreme and is greatly appreciated. Ok, so your saying that it would be nearly impossible to hold a steady FC level with no CYA in the water, even with only a few hours of direct sunlight on the pool. What would you suggest as a rock bottom minimum level the CYA be at in my case? The sun hits between 1 and 3 pm during June and July. May, Aug, and Sept, it's more like 1 to 1.5 hrs of sun. Could I get away with the numbers you would suggest for an indoor pool? Some of my curiosity lies in a possible savings of $ when it comes to chlorine. And, also in the possibility of increasing the FC effectiveness. Then again, if it only would lead to $20 to $30 savings a year, and leave me with nothing but frustration it's not worth it. I guess the saying, "if ain't broke don't fix it" comes to mind here. I may still try no CYA at first to see how it goes for a week or so. Like I said, it's a ways off yet, but since I'll have the opportunity in spring, who knows?

Thanks again everyone,

Ken