How do i get rid of brown ring in my swimming pool 27inch round above ground pool?

Question

i scrub my pool and the brown ring and a couple days later its back on there. now the brown ring is working its way up the walls of the pool. it comes off but wont stay off. i put all my chemicals in but get no reading. please help im so frusterated.

Answer 1

you may have a ring worm that was too small to see when it first started now you cant send it away cause it too grown now??

Answer 2

idk try hydro chloric acid. A high enough concentration eats through just about anything.

Answer 3

Have you tried murietic acid?  I don't have a pool, but have used this on rust stains and know that this acid can  be safely used with some pools.