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There is a large brownish area on the wall of my pool where the return jet is located. I have tried to brush it off, but it will not come off. Would anyone know what would cause that, see attached pictures. FC-8, a bit high I turned the generator down this morning from 25% to 15% CC- 0.5 PH-...

Where can the plugs be purchased to clean a Jandy Aqua pure Model R0452400 salt cell? Are they any after market plugs that can be purchased instead of the Jandy plug kit?

Is there a particular order chemicals should be added to a pool to get them into acceptable ranges? My test results are FC- 3 TC- 3 PH- 7.8 TA- 70 CYA- 50 CH- 525 Salt- 3500

Is there a good place to buy quality pool chemicals other than the local pool stores? The pool stores seem so expensive.

What is the best water testing kit? Are there any good home digital water testing kits?

I have a black stain on the wall of my pool, it is ~ 1.5' below the water line. I have showed it to the people at the local pool store and they had me treat it for black algae, but it did not take care of the issue. Please see attached pictures, can anyone ID that spot, if so would you know how...