We are at our wits end with this one.
We have a 24 round AG, approx. 15,000 gal. Sand filter (don't know details).
Water got a green tinge, so we shocked, flocked and got a mess of dead algae (brown) on the bottom.
Water was clear, chlorine and pH balanced. We vacuumed on waste setting, backwashed and rinsed the filter.
Beautiful. Crystal clear, all dead algae gone. Next day, though, the brown algae dust was back. We repeated this procedure at least FOUR TIMES, and each time, the brown dust of algae returns. My water bill is through the roof for the refilling every time we vacuum on waste, and I don't know how to get rid of the stuff!
We've had this pool for 5 years, and never had this kind of problem before.
Can anybody help???