Hi all, hope someone can help. I have a 20 x 36 pool in chicago, with all Jandy equipment built last year. Builder sold me chemlink c1900. Last year orp was not properly hooked up, I only learned this year, but seems to be functioning now after repair. Strangely, my Ph always gets offset and goes way off the scale, randomly. The entire chemlink and probes have been replaced 3 times by builder and Jandy rep from Zodiac. This has not helped the issue. Ph still bounces like crazy, and if within range, the system then dumps acid in the pool! Great! Been a real pain. Jandy rep has no idea, and can't even get answer from national headquarters. Any input would be great, as I'm very close to returning this product. Ph definitely worked last year, so seems that something in the winter created a glitch that causes it to lose calibration after I calibrate it. Ph in pool and all other chemicals spot on. Thanks!!!!!