Hello, 1st post here. Just registered at TFP but lurked some last year. Feel like I have a pretty good understanding of Pool School and your posts have been more than informative.
30,000 gallon pool. Left pool open last fall, yard surrounded by trees, all leaves fell in pool, spring came (filter had not been running), algae - dark and green. Dark and murky swamp. Basically couldn't see the first step in shallow end.
Started out last week scooping everything I could out of there. Then on Saturday, dumped 5 121oz bottles of 8.25% bleach in late afternoon/evening. Next morning FC was at 0. So I hit it again and again. By Sunday evening I had FC readings, and only have been losing a couple of ppm overnight since then. Still bringing back up to shock level (or what I perceive to be) , or a little higher.
The pool went from a dark murky green to a muddy brown in a day. Still keeping at shock level (or higher), backwashing when filter pressure gets too high. Probably have backwashed 8-9 times since Sunday. Been at a muddy brown for 3 days with absolutely no change. I have not been able to get a CYA reading. I put 4 bags of dichlor shock in Sunday along with 4 trichlor tabs trying to bring up CYA but no luck yet. (Sidenote - My pool gets full sun for approx 5 hours a day). Been keeping the FC beween anywhere from 3-6 during the day. Not trying to go too high. (Is it possible I had 10-20 CYA and it just wasn't registering and I have not had my shock level high enough?) Decided to go a little higher on the FC this morning before I left for work. Here are my #'s now measuring at lunch:
FC - 11
CC - 3.5
TA - 40
CH - 20
CYA - 0 (0-20?)
PH - 6.8
Could someone please offer some kind advice on how to proceed from here to clear up this muddy brown water? 3 days - no change. Should I keep my shock level higher than the 3-6 range I have been keeping it in? I was going to try and get my water clear first before worrying about TA and PH levels. I know it's only been 5 days, just figured that muddy brown color would have at least changed a little in 3 days. But no, it's the exact same color.
Should I vacuum even though I can't see the floor?