Not that I can help explain anything, but what was your pH? If it was on the high side, maybe FC of 7.5 isn't enough.
Not that I can help explain anything, but what was your pH? If it was on the high side, maybe FC of 7.5 isn't enough.
If it's mustard algae, it is entirely possible as i've learned first hand, 15 ppm only slows it down.
Check here for a visual comparison
http://www.poolforum.com/pf2/showthr...?t=5612&page=2
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