Quick story, we opened our pool almost three weeks ago to a massive slime pit courtesy of the last owners. It's a 24' AG with a 150lb sand filter and a 1.5hp pump. Current numbers from our Taylor test kit:
TA: 100 (was 230, brought it down via acid and aeration)
pH: 7.0 (seems to sit normally around 7.4, it's still coming back up from acid treatment)
CYA: ?? (Water is too cloudy to test it, I've put around 4lb of granular CYA in there which should put it around 40)
I've been shocking it nightly with 6% bleach. I'm losing about 5ppm of FC a day to sunlight still, which surprises me based on what the CYA level should be. The water went from green to blue grey, then back to green again after I vacuumed for a few hours a week ago. There was a bunch of leaves and crud on the bottom I couldn't see and a lot of dirty water shot right back out of my return line. I vacuumed and leaf raked for most of the day and I'm pretty sure I got the bulk of it.
Since then I have been brushing daily to stir things up and continuing with the shock / filter treatment. The water is back to a milky blue, and I can see specs of dead algae floating in it that seem to be sticking together; they were finer before. I have maybe nine or ten inches of visibility if that.
It just doesn't seem to be improving anymore and I'm very frustrated. I disassembled my filter thinking it might be broken and I can't find anything visibly wrong with it. I backwash from time to time but the pressure builds up VERY slowly, which makes me think either the particles are too fine for it or it it's just malfunctioning somehow. I'm very close to just buying a new filter / pump combo.
Anybody have any ideas? Help!