Re: Light brown stain below water line
Sounds like you may have some metal staining. You can try crushing some vitamin C tablets and put them in a sock , or some ph down in a sock, and rub it on the stain. If the stain lifts, it is mineral. If you rub a chlorine tab on the stain and stain lifts, it is an organic stain. With a cya over 100, I would drain the pool down 1/3 and add fresh water, do this a couple of time till you get your cya down to about 50 check out this chart:
Use the info in this chart to help you figure out what levels of chlorine you need to maintain in your pool based on the amount of CYA (cyanuric acid, also called stabilizer) that you have in your pool. (FC = free chlorine)
Stabilizer . . . . . . Min. FC . . . . Max FC . . . 'Shock' FC
=> 0 ppm . . . . . . . 1 ppm . . . . . 3 ppm . . . . 10 ppm
=> 10 - 20 ppm . . . . 2 ppm . . . . . 5 ppm . . . . 12 ppm
=> 30 - 50 ppm . . . . 3 ppm . . . . . 6 ppm . . . . 15 ppm
=> 60 - 90 ppm . . . . 5 ppm . . . . . 10 ppm . . .. 20 ppm
=> 100 - 200 ppm . . . 8 ppm . . . . . 15 ppm . . .. 25 ppm
You can add washing soda, which will take the alkalinity and ph up. You need to get them in range so that the the water is not so acidic, which can damage a vinyl liner. After you see what the stain is (organic or mineral) we can help you more. Don't be discouraged
Northeast PA
16'x32' kidney 16K gal IG fiberglass pool; Bleach; Hayward 200lb sand filter; Hayward pump; 24hrs; Pf200; well; summer: none; winter: mesh; ; PF:7.5
Bookmarks