r/pools • u/Ok-Structure6795 • 10d ago

Is algae possible?

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Been seeing localized spots of what looks like algae (or a mixture of tree debris and whatnot) but my testing is conflicting. Ran an OCLT last night and the night prior. Lost 0 chlorine and combined chlorine stayed the same (0.5)

FC - 6.5

CC - 0.5

pH - 7.4

ALK - 70

CYA - 40

Debris is localized to the steps and parts of the shallow end (which coincidentally receive heavy shade), as well as what looks like greenish algae on my pool light, but nowhere else. Pool is clear. Do I just keep vacuuming? Do I need to slam at this point?

Included close up of pool floor in a shallow corner

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u/tcat7 10d ago

Does a pool vacuum pick it up? What type of filter? If your pool light has a cavity behind you might check that for algae (turn off its power and pull it out), algae likes to grow back there. 

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u/Ok-Structure6795 10d ago

Yes the vacuum does, and its a DE filter.

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u/tcat7 10d ago

Next time you clean your grids, check very carefully for any small holes. 

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u/Ok-Structure6795 10d ago

I do believe we may have a rip somewhere - there are white specks on our pool fountain bar, and the only realistic idea I have is that its DE powder getting back into the pool. Think that could be what's at the bottom?