Some algae, like black algae, actually have roots that dig into the pool finish and sometimes the only way to eliminate them is with a chlorine wash. Most pools are prone to black algae because they hide in the hard-to-reach areas of your pool. If you don’t get every inch of the pool each time you brush it those missed areas are where it is likely to grow. If it has already taken hold, algae can sit in these areas unaffected by your work and continue growing, at that point it’s definitely time for a chlorine wash.
Even if you do not battle algae regularly, we recommend chlorine washing your pool every 3 years to sanitize and clean the pool interior and leave a fresh bowl filled with new water for your family and friends to hang out in.
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