We live in rural area and get our water from a well. Due to the high iron content in the water, beyond all of the normal considerations for purity, chlorine [bleach] is required to react out all of the iron. For years I used diaphram-style pumps that had a life expectancy [based on my experience] of about three years. The last time I bought a peristaltic pump, which definitely eliminates many problems but only lasted three years. Apparently a shaft broke inside the pump assembly. At ~ $500 a shot, it would be nice to find a pump that actually lasts for more than a few years. Any ideas? They are very low volume - something like 2 gph... maybe more like 1 gph. I would have to check - and adjustable. It must have a discharge pressure higher than the maximum system pressure of about 70 PSI. The pump injects diluted bleach into the system just after the booster pump and before a reaction tank. After the reaction tank it goes through a clarifier that removes the iron (II) chloride. The chlorine pump comes on whenever the main water pump turns on, so it is intermittent duty, but it can run for long periods of time during heavy water use.