Cloudy water is it my filter?

[Skymarc]

Hi all, new to the forum.
I have a 20 x 40 vinyl liner pool, about 30000 gal.
TC 4
FC 4
PH 7.2
TA 74
Cal 72
Copper 0.9
CYA 0

I had lots of leaves and dirt in the spring and had to use a lot of chlorine.

Now that the pool is very clean I'm still dumping 4-5 gal a day of 12% liquid chlorine and by the next night its down to under 2 ppm or 0. I just added a box of Borax to raise PH. Water is cloudy, cant see the bottom of the pool but its clean with no slim in the bottom as I was in it today.

Seems that my sand filter is not doing the job. I have a 25" Ranger filter with a 2 hp pump on 1.5 " piping. Pump is running 24 hrs a day. I changed my sand last year to a finer sand that a pool guy around here recommends.

Not sure it works as when I was cleaning with my kreepy krawly in filter mod it would come back brown from the returns. I bought a Dolphin robot cleaner and it cleaned out the pool really clean.
I don't see any algae but why I'm still using so much chlorine? Wondering if the cloudy water comes from the filter not filtering?