I have some organic stains in my gunnite pool. Thunderstorms here blew copius amounts of crepe myrtle flowers & seeds in our pool. As a result I have what looks like tobacco stains on the gunnite surface at a depth of 9 feet.
Does anyone have a suggestion for how to clean these stains? I have successfully cleaned some of these stains by scrubbing BioGuard chlorine tablets directly onto the stain.
Help, please? Thanks