24' 15,000 gallon salt. Everything was fine, chemistry was good per pool store but they recommended 24 oz Phosfree due to elevated phosphates 400ppb. Added that last night and about mid day today the surface suddenly foamed up. Acts like it is clearing up and then covers the whole surface again. Any ideas what this is?
run filter and SWG 3 hours at a time for total of 9hours. turned filter on constant when foam appeared.