My 20,000 gal inground pool is generally slow to clear but this year has been particularly bad. TC on a strip appeared high, but FC was 0, even after 3 x 1 lb bags of shock. After finding this site, I am now seeing progress - quit the shock and found 12% liquid hypochlorite at BJ's ($3/gal). 4 gallons x 2 days of this later, FC is measurable and I even see hints of clearing.

My question regards the persistant foaming - looks like laundry day. Should I worry about this now, or wait until pool clears and FC is stable?