I am running a Hayward pump, Hayward sand filter, have a central floor drain, a skimmer, and a single return on an above ground, vinyl, 24' round pool. The Hayward H150 heater didn't start this year so it's not running.
Last year I didn't close my pool properly and didn't cover it. Removed all plumbing, pump, multi-switch of sand filter, and covered the sand filter, but left the pool uncovered except for the solar blanket. (I'm an idiot, I know).
The week before Father's Day I decided to take my lashings and try to fix my egregious mistake and the swamp my pool had become.
I replaced my plumbing lines to take out a chlorination tab holding unit the previous owner used - now it goes straight from sand filter to heater to pool.
Next I uncovered the sand filter and ran fresh water in it using a garden hose to coax anything not removed by backwashing. I moved the hose up and down through the sand, as I'd seen on a YouTube video, and a tremendous amount of leaves, branches, and flotsam and jetsum came up and out. I wanted the filter as clean as possible.
I started by dumping 3 gallons of 12% pool shock from Menards, knowing I was starting at zero and the pool was disgusting. I put the pump on to run 24/7.
Within a day or so, the water turned blue but didn't clear. I got in the pool to do a full brushing and found the walls were covered in something that felt like sandpaper. Did some research and read it was most likely calcium scaling. I used a Scrub Daddy rough sponge to scrub the sides of the pool and stairs (which I had left in all winter too) and found I was able to get most of it off.
Fast forward to this week, 5 weeks later. After adding Muratic Acid my pH is now balanced, and the last parameter that wasn't.
As of this morning my readings are:
FC: 10
CC: 0.5
pH: 7.3
TA: 90
CH: 75
CYA: 25
Filter has been running 24/7 since the Thursday before Father's Day, and I still have cloudy water.
I originally thought it might be calcium dissolved back into the water, but the CH reading is lower than I've ever had, so I'm suspect of that.
I also thought the contaminates are dead but too small for the sand filter to mechanically filter effectively. Is there anything I can use to try to precipitate these things out? Is adding DE to the sand my only option? I don't think it's worth plumbing in a cartridge filter, as I've never had this issue before, but I'm kinda at a loss.