Hello, I just moved into a home and purchased a new AG 33' pool. I filled the pool with Well water. I put a gallon of liquid chlorine . The pool took 3 days to fill. The water is brown looks like a lake. Can anyone help me?

Test:

Free Chlorine (ppm) <10 high
ph 7.8
TA 180
CA 100

Any help would be GREATLY appreciated.

Thank you,

Lisa