Took a sample to my local pool supply place.
The following is the results they gave me.

FC 3.0
Tc 3.0
Ch 250
Cya 40
Ta 100
Ph 7.6
Copper 0
Iron 0
Tds 1000
Pho 300

This is everything I have done so far.
Pool was green at the start.

I added 4 gallons of chlorine, 2 lbs shock, and algaecide.
Filter 24/7.
Vacuum, clean filters. Etc.
ph was at 7.8 alkalinity was 140 so I used muriatic acid about 1 gallon to drop both.
I then used 2 boxes of borax 20 mule to raise the ph.
I have added 5 lbs of stabalizer since my chlorine kept going away

According to the pool place all my numbers are good except the phosphate one is high.
But my question is, why is my pool still so cloudy??
Hope this is enough information to get some good help

Sand filter, and my pool is about 15-20,000 gallons.