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    Possible algae but no OCLT drop

    Hi all, Greatest appreciation for all the knowledge and insight here. Have a qst - Is it possible to have active algae with no overnight drop of FCL levels? Attached some pics, does seem to be spreading , maybe I have some cl resistant form of algae? Or maybe it's just sand, I'm looking to...
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    Yellow algae or sand/

    Hello all, new to TFP. haven’t done an OCLT yet (looking to get fas dpd test kit) could anyone confirm (by looks) is this is algae ? I think I’m in denial. There is a backstory including my SWG being out of whack for couple months and pool turning slightly green, I did the stainless steel...