DON'T adjust PH with high chlorine levels - the high chlorine will mess with the PH test. Err on the side of caution and wait for your chlorine levels to drop below like 20ppm.
What have your chlorine tests been looking like? Make sure you are backwashing and scrubbing - now the filter needs to start cleaning out the dead algae. Keep the chlorine levels high to make sure that none starts growing again.
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