Recent content by greenthumb

In Miami Florida I have a 10K gal IG plaster pool, 35 years old. My problem is that green algae rapidly reappears on the bottom and sides soon after shocking with 2.5-5 gallons of 10.5% bleach. After reading advice here, I added PolyQuat 60%. Initially 12 oz, then 3 oz the next week. Still...