Re: UnknownStain - Fiberglass Pool
It may be a metal stain. If you have any ph down, or some vitamin C tablets, you can try it on the stain. Crush the vitamin C tablets up and rub it onto the stain. IF the stain goes away, it is a metal stain. You can also try some ph down in a sock and rub it on the stain. Your fiberglass pool will stain from metals very easily. Adding the soda ash could have reacted with the chlorine in the water and dropped some metals out of solution. If it is a metal stain, you will need to get some metal sequesterer, lower the ph down to 7.2 and add at least as much as it says on the bottle, more is better than not enough. IF the stain is not removed after a few days, then you can do a stain treatment. Let me know how you do, and feel free to ask any questions you may have.
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
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