Just added pH up and pool got cloudy

[Mr Bill]

My pool clouded as I poured the dilute pH up into the pool. This wasn't algae growing!

My CH is 120 (160 before pool draining). Thats low I know, but I just drained the pool earlier this week to get the CYA down from 135. I also had phospahates greater ~2500. Treated the pool yesterday and brought the phosphates down to ~100.

I thought there might be residual Phos-X in the pool that may have contributed to the cloudiness but didn't mention it since I could still detect some phosphates. I used 12 oz in am (tested PO4 ~1000 ppb) then went with 20 oz to finish treatment at noon. Dosage for decreasing PO4 1000 ppb per bottle directions was 32 oz, and I used just 20 oz in the second treatment. Cloudiness was minor and pool was crystal clear before I added the pH up.

My problem, which I thought I treated correctly was algae.
1. Lowere CYA by draining 1/3 of the pool (20,000 G)
2. FIlled pooled, add alkalinity to ~120 (test strip)
3. pH was 7.4, TC 3 (OTO), FC ~1 (test strip)

This am pool ph was 6.8-7.0 by OTO and test strip, so I added 2 lbs pH up.

So there' sthe complete picture.