Chem Geek,
Will do, have backwashed it once for two and half minutes of whitish-grey powder. Patience you say don't you remember I am half-German, that word is not in our vocabulary
Getting dark in an hour so will pump up the chlorine and check in the morn. Hope that it will be the same; if it is, sell Wal-Mart's stock, as I will not be shopping there for a while!
Aloha
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