Hahaha! Thanks for putting up with me, Carl, and for understanding.

Ok, so the copper thing is not correct? I did wonder about that. The cell uses NaCl to make Cl, so why would it need copper added?

Not all of my pool friends are this . . . uh . . . resistant. A couple of years ago Jane bought a house with a pool. She sent me an e-mail: "Tell me how to take care of it." I talked to her about getting a test kit, about BBB, about using pool stores for hardware and the grocery store for chems. Went to visit for the house-warming, her pool was perfect. Jane's comment was: "I've seen your pool, I've watched you care for it. You know what you're doing and I wanted a piece of that."

It's very gratifying when that happens. It would be nice if my Virginia friend would see the light but I'm not going to hold my breath.