Thanks again Marie.

Two follow up questions:

1. You mentioned a few sequestering agents. They appear to be about $20/qt. What I've been using is Pool Magnet by Bioguard. (Also $20/qt, grrr.) Would you know if this is the same kind of thing?

2. Are there any homemade sequestering agents?

Best,
Paul
_ _ _ _ _
They laughed at Joan of Arc, but she went right ahead and built it.
Gracie Allen