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I have a borate pool with SWG, and standalone spa with small, drop-in SWG. My normal practice has been to replace spa water with pool water, pumping spa into pool & vice versa. Simple and fast. I recently did some repairs to spa, and decided to start using spa frog bromine and mineral...

I added DE to my sand filter---enough to raise pressure 1 psi (from 10 psi to 11 psi). This took 7 cups DE---I have a larger sand filter. For the rest of that day, the pressure crept up slowly, as the pool got noticeably clearer---nice! By the end of the day the pressure got up to 18 psi, and...