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Okay, nevermind : both probes were just somewhat dead. Bought a new one, and confirmed both were dead... ORP/chlorine levels are now consistent relative to last year observations. Sorry for the noise.

Thanks for taking time to reply. There's so many contradictory articles about it, and the fact that my water is crystal clear despite the high temperature in the smallest pool (92°F) sounded like a confirmation. Most articles, if not all, I stumbled upon seems to agree that sanitation is in...

Hi there! First of all, please apologize for any approximative English, I'm not a native speaker... I'm owning 2 residential pools (~10000 gallons non heated, and ~2000 gallons heated @ 92°F), both using unstabilized chlorine, with PH and ORP regulation (I know). I'm using a Pool Lab 2.0...