Hi,
I spent time yesterday reading your forum. Pool has been cloudy since a big pool party a week ago. After the party we cleaned the cartridge filter but (told ok to do by pool company) left the filter in the container. The dirty water backwashed into the pool(our mistake not realizing we should waste it). Cloudy ever since. Took forum's advice and checked with Taylor test kit last night. Very low ph and alkalinity so added soda ash and sodioum bicarb(had it on hand. This am the numbers are:

ph 7.4
alkalinity 120
FC16.5
CC .5
CYA 120

(calcium hardness was fine last night.)

It is still very cloudy. We had added two rounds of improve polysheen blue over 72 hrs which did nothing. It's a big pool, 48,000 gallons.

Thanks for any help you can provide.

Mary

ps we also coated the filter with sparkle up on advice from the pool store which did nothing so we cleaned the filter(took it out) two days ago.