IG Vinyl 25,000 Gal pool
New filter last year.
New heater last year

Water got a little away from me: Ph too high (8+), and some vague green cloudiness. (I usually like to keep my ph a little high - 7.6-7.8.) Chlorine was all gone.

Got ph down quick with muriatic acid - now at 7.4. Shocked the pool 2 days ago (TC up to 15), and now water is cloudy, but white. Filter seems to be pumping plenty of water, and I've backwashed several times. Clorine level still very high from the shock - weather here is hot and has been cloudy, but is sunny today.

Numbers from this morning:
FC: 11
CC: 0
Ph: 7.4
CYA: 50
Alk: 160
Temp: 78

Last year, I had my CYA lower, my ph higher and although I had to add bleach a lot, the water was crystal clear.

Any idea where the cloudiness is coming from? I thought it might be dead algae, but the filter should have taken care of that, right?