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Great points all. A few additional observations: After a few months in operation using Analog output pressure sensors, I replaced them all with I2C. The analogs were way too sensitive to the environment, noise, temp etc. Gamico transducers are $38/ and worked beautifully. And i don't have to...

Some further thoughts on a PAS: I built a chemistry monitoring system, based on an arduino Mega 256. It monitors pH, EC, temperature and filter pressure. It also provides DC current via a pair of relays to a the copper ionization system I use in lieu of the typical chlorine based treatment...