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    brown residue stuck to bottom and sides

    I have been treating with slam method for 4 days, keeping chlorine at 20 ppm. 16000 gallon pool with CYA of 45. Green algae is gone, water is clear but there is brown residue spots on sides and around lights. It is also accumulating around the edges where side meets the bottom. It does not brush...
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    New member Timothy5950

    I am a new member from the Austin, TX area. I have used pool services for many years but have not been satisfied with the service for a while so I decided to take it over myself. For various reasons beyond my control my pool became a green swamp. I started by using powered shock and got pretty...