Hello everybody. I have a approx. 25,000 gallon unground pool w/ Hayward S244T sand filter and a 1 hp Hayward single speed pump. I live in Upstate NY, it was my own mistake for not opening the pool up earlier. I was on vacation and it covered with a hard fabric stretch cover. I opened it on 6/17/16 and it was the most disturbing thing i have ever seen. A thick layer of green and black algae was on the stairs and the whole water was black. I started with 10 gallons of pool chlorine at 12.5% while the pump is running. I then did another shocking the next day with another 5 gal of pool chlorine. Followed by another 3 bags of cal hypo granular shock dissolved in homer bucket for each bag. Then once i felt that everything was killed i added some algaecide to help the chlorine. I then finally went from black to dark green to dark blue then to hazy blue. Since my sand filter has not been changed in 12 years, i changed both the sand and the laterals and re-leveled my filter since it was crooked anyway for some reason. I owned the house for 3 years now. Had pool for the 3rd season now. Last year i opened early may and it was all peachy. I have balanced all my numbers now and the water is clear to where i can see the bottom drain 9 feet down but i have to strain to see it. There is still slight cloudiness to the pool. I have been running pump for 2 weeks now. Pressure is constant due to new sand. I have added clarifier as well a couple times and that probably helped. I hate adding anything other than pool bleach My numbers are balanced. Why is it taking so long? I am holding chlorine well. Everything is dead. Is it because I had so much algae in there? I think by Jul 4 it will be crystal but i don't get why it takes so long with new sand. I don;t want to add DE as this is new and nice sand. I have been swimming and the water smells and fells nice, but not perfectly clear. Thank You for your advice.
FC - 6
CYA - 30 (I know it's low, but have been running 3-4 tri-chlor pucks in skimmer to add CYA since pump is running 24/7. That's how I went from 0 CYA to 30. I like it low and slow...lol.
At this CYA level, i think I am pretty well sanitized, probably too well.