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This is definitely a new (in the past weeks) sound on my relatively new pump. The sound only happens at low rpm (500). It goes away at 750 rpm. only concerned because it's a new sound Thoughts? Thanks! Edit sorry still trying to figure out how to add audio, MP4 file m4a file hopefully attached now

14k gallon pool/hot tub. pH 7.4 Fc at least 10 (11 yesterday on drop, diluted 1:1 and on color test at least 10 Cya 60 Ta 120 Ch 475 I left the autocover off in anticipation of water (and drained it a bit yesterday so I didn't have to worry about the pool cover being on and pumping off it)...