Cloudy water is it my filter?

[Skymarc]

Just want to update.

I took my sand filter apart, found out that the installer 7 years ago had use a 1.1/4 pipe standout on a 2" filter head. Spyders were ok. No wonder it wouldn't filter. Glued in an adapter and pipe to 2" and reinstall my sand and filter head. Big job on a 30" filter.

Within 4 days the pool as clear up perfectly.

Added 2 box of borax and 1 box of sod bicarb.
Added 3 x 2 kgs of stabilizer and now the pool is clear and uses very little chlorine.

Here are my numbers, from the pool shop test but mine are basically the same.
FC 3
TC 3
PH 7.5
TA 140
CH 220
CYA 70
Borate 30
Copper 0.5

I took a sample of water to my pool shop and they gave me a perfect water balance certificate !
Thanks for the help.

Now I got a few stains on the liner, whats the best product to clean does?