I have the same issue. Had the same issue with the classic and now with 2016. One day salinity is running fine and next it just shoots up for no reason. Probe month old. I clean it every week with towel and rinse it around in tank. Normally runs way high for a few weeks then just drops back down then after a week or so goes back up. just back and forth. I even ran a PVC pipe through my wall and the probe cables run through it. NOTHING touches the cables yet just last night right at midnight it went from 34.60 to 35.40. ATO and floats etc all work correctly. My heater hasn't kicked on in forever (live in Lafayette La so always hot never need heater) so it cant be that. I cant figure it out for nothing but aggravates me. I've mentioned it to Neptune a few times and they keep saying its better to just watch for large swings than actual reading. thats a little annoying but they are doing the best they can with it, I get that, but sure wish someone could figure out the cause bc I cant... also I've verified it with a refractometer and a Milwaukee digital refract and both read 34 / 1.025. Also only other thing in that section of sump is the heater and skimmer. no cords come within 6 inches of power cables at any point. figured I'd join in bc if anyone figures it out i'd sure like to know.... Its the only thing I can say doesn't work properly on my apex. all else is perfect! (knock on wood)
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