Chem Geek,
You might be on to something here about "Phosphate Remover".
A little while ago I did add phosphate remover and as I still had such a large bottle of it left I have been using a small dose of it once a week. It seems to help the ORP stay higher and more consistent. Some say because it is dirtying the filter.
I did not want to add that to my post as many persons feel that it is a "Snake Oil" remedy, which indeed it might still be. I too am beginning, however, to have a sneaking suspicion that it might actually be helpful, even though my original levels were far lower than yours on the test being over 200 but under 500.
Maybe we could get on the front page of the "Phosphate Remover Monthly" as originally skeptical converts. I'll call my agent about royalties, 50-50 ok with you?
Seriously I think that maybe something in it is not liked by what little black algae remains secretly hiding out in my pool and that is why the ORP is better and more consistent, although I feel the HOCL above 0.075 is the most beneficial treatment.
Like you I have green algae at the skimmer above the waterline but it is not a problem. Maybe we could invent "Skimmer Algae Remover" and retire!
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