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Taking samples: OnBalance’s position regarding the cause of spot etching is largely based on petrographic studies of core samples drilled from problem pools.

Taking samples: OnBalance’s position regarding the cause of spot etching is largely based on petrographic studies of core samples drilled from problem pools.

On campus: The National Pool Industry Research Center studies were conducted at Cal Poly San Luis Obispo by pool and spa professionals, along with university faculty and staff.

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