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We use our SPA every other day and we use Chlorine and keep a close eye on the water health. Noticing our test strips were testing high for Cyanuric acid (CYA) and the PH kept going very acidic (dark brown off the scale, this is a good sign of CYA overdose), we constantly had to add alkaline everyday but only really reducing the alkaline small amounts. The chlorine remained high even with not adding it for a several days as though the CYA was keeping hold of it in the water. We discovered the stabiliser part of most of the chlorine tablets/ powders is CYA and the tub was overdosed with it causing all readings to go out. I beleive this is fine in conditions where your hot tub cover is mostly off in sunny areas as this burns off, but in our case where we have to put the cover on after use as it's cold in England generally we found this issue. We replaced half the water and switched our chlorine tablets with a liquid that contains no CYA (this is hard to find, and you MUST read the ingrediants as there's products out there that claim its free of CYA but when reading the ingrediants it not). After using the liquid the levels went back immediately and have been perfect ever since.. we’ve been able to put less chlorine in and hardly adjusted the Ph, and it stays balanced with less foam. we believe that the CYA will burn off if its exposed to UV over time but this case as we have to put the cover on regulaly so there's no way for it to escape or lower. I hope this helps some people.