I recently installed a Pentair Whisperflo 3/4 HP pump and a 48sqft FNS plus DE filter. I went on vacation 1 day after the install. I returned 4 days later to a pool that was 90 degrees (when I left it was 70) and a very hazy pool. Turns out while I was gone one of my relatives came over, turned the heater on and didn't shut it off. Compound the high pool temp with 95 degree temps and I had zero chlorine. Last night I added 3 gallons of bleach and it brought the FC to about 8ppm.
Now the pool is clear but I develop sediment on the bottom of the pool. I vaccum it up with my blue diamond but it returns a few hours later. What is this precipitate? I am thinking it's either dead algae or something, even though the pool wasn't green or DE.
I am concerned because the pump is on a timer and if the heater was on when the pump shut off could it have damaged the grids? I plan to backwash tomorrow and inspect the grids but the filter is brand new so I am hoping not to find anything unusual.
Any advice appreciated.