I am literally at my witts end here and hoping someone here has some advice. I use 8.25% bleach, CYA is at 30. Been seeing brown spots in my pool for a few months now, I sweep it away and it disappears until the next day or two. During this time the chemical levels were all good--CYA 30, FC 2-4, CC 0, PH 7.5, Alkalinity 90. From what I read I determined the the brown spots to be mustard algae. The brown stuff was not gritty like dirt or sand, it was not pollen, if I touched it it would quickly disappear. It's normally found in the shallow end in different areas. I started SLAMing my pool Friday evening keeping FC levels at around 13 to 14. Pool finally passed the OCLT test yesterday on Sunday morning. I then raised to Mustard shock level of 19. A few hours later I checked and it dropped to 15 FC so I added more bleach and kept it at around 19 the remainder of the day. Today (Monday) I went and looked at pool and saw the little brown spots starting up in my pool once again. I don't understand, my pool is still at high levels and it's back already!! I have spent tons of money on this weekends SLAMing alone, and feel it was all for nothing. Any suggestions?? Thank you in advance.
25,000+ gallons
vinyl in-ground pool
CYA 30
FC 19
PH was normal at 7.5 but now high after all the SLAMing
pool is in full sun, temps stay in the 90's everyday usually all summer long.
25,000+ gallons
vinyl in-ground pool
CYA 30
FC 19
PH was normal at 7.5 but now high after all the SLAMing
pool is in full sun, temps stay in the 90's everyday usually all summer long.