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(Earlier version posted in the Spa forum, deleted by moderators, hopefully this is the right home for it. Apologies for that earlier violation of forum rules!) Five years ago I moved in with my girlfriend, now wife. She has a 1997 Hot Springs Prodigy spa. Her maintenance routine was to toss...

I'm a long time aquarist, kept large planted aquariums with added CO2 and macronutrients, etc. Not relevant here except I'm accustomed to measuring and adjusting water chemistry. Everything I know about spas I learned from this forum during the last few weeks. So a couple of years ago I moved...