Hi! So I replaced water and brought my CYA down to 50, reduced my pH to 7.2, and brought the chlorine level up to 20. Ran the filter overnight and today noonish the chlorine is a 22, with 0.5 CC. That means nothing is happening, correct? I brushed yesterday, and back washed the day before (although I just realized you need to add back DE after backwashing). Is the lack of DE why nothing is happening? It's yellow algae that doesn't budge when brushing. Could it not actually be algae? I am feeling stuck... any bright ideas?
Pool is 20,000ish gallons, not salt, pebbletec finish. I did previously have high CYA (thanks, pool company). It is high in phosphates, which I know shouldn't matter.
Pool is 20,000ish gallons, not salt, pebbletec finish. I did previously have high CYA (thanks, pool company). It is high in phosphates, which I know shouldn't matter.