CarlD,

Thank you for the indepth help. I'll try it and let you know what happens.
I'm on the verge of throwing some pucks into the chlorinator and calling it quits to the "natural" way.

No, I've not tested for copper or iron. Where and how do I do that?

mwsmith2,

I know my pool isn't 20,000gal. No one, including the Doughboy company, can give me an accurate capacity. I've gotten everything from 13K to 19K. Doughboy says it's "somewhere around 15,000". How's that for engineer's accuracy?

Thanks for your suggestions too.

Maybe between us I can get stabilized.

CoffeeBean