At what point to you say "forget it" and drain the pool?
I have the unfortunate combination of high CYA (99) and mustard algae (green and yellow) on the south wall at the bottom and spreading.
The south wall is the deep end
Just for giggles:I had Leslie's test the water - they actually printed out OK beside a FC of 1.5 (their target shows 1-4). They use the term "Free Available Chlorine" if that matters.
While I"m here - what is OCLT? I didn't find it in Terms and Abbreviations.
I am seriously considering draining the pool entirely and letting the sun deal with the algae. To get the CYA down to levels which make a Mustard Algae shock affordable, I'd need to drain and replace about 1/2 of the water (yes, I do realize that the shock would best be performed when the water level is lowest).
How long would the pool need to be dry to eliminate the possibility of re-infection?
Opinions? Alternatives? Anyone have a way of "spot treating" mustard algae? From the instructions, it would seem that a spot treatment would simply clear the deck for the free-floating spores to have a nice-clean home.