Pumice PB-80 Pool Blok Pool and Spa Cleaner - 6-1/2" x 1-1/2" x 1-1/2
Pool Blok is a pumice stone tile and concrete cleaner. It removes lime, rust, stains and algae from ceramic tile, molded or pneumatic formed concrete surfaces. There is no need to drain your pool since the Pool Blok floats! It is chemically neutral and won't upset pool pH balance or harm hard surfaces. The Pool Blok cleans even where the strongest acid cleaners have failed.