Pink Treat kills Pink Algae and Bacteria to keep your pool clean and clear. Pink Treat is an EPA-registered patented algaecide that is specifically designed to kill Pink Algae and bacteria in any type of swimming pool. A lesser known fact about Pink Algae is that it is actually a type of bacteria that grows in swimming pools. Pink Treat is specifically formulated to eliminate the presence of these kinds of bacteria to leave your pool crystal clear and safe to swim in. Pink Treat is very easy to use: simply add one bottle per 20,000 gallons and superchlorinate to wipe out any presence of Pink Algae/bacteria in your pool.