Temp for water @ 66-68
Pool looked very clear. Cleaned and vaccumed it. Used the brush to move acorns and noticed a white chalky substance lifting when I brushed, primarily in the deep end. Pool has not been green. Chlorine has been holding between 8-10 for weeks. Do you think the chalky residue is calcium? Or old dead algae? I am confused about the saturation index and what to do next. Trying to keep PH on the lower end because I get continual staining due to hard water from my well. I plan on closing in about two weeks.