Oxalic Acid to Treat Fungas on under side of a gunite pool

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Re: Oxalic Acid to Treat Fungas on under side of a gunite po

The high CYA just causes you to have to maintain very high FC levels to be effective. If you constantly maintain those high FC levels the stains will lighten. You need to keep it in the 12 ppm neighborhood all the time with a CYA of 150.
 
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