Paul3894 Posted March 12, 2021 Report Share Posted March 12, 2021 I have a Rainbow 320 in line chlorinator. It already has a check valve incorporated in the bottom of it. Pool guy told me today I should have another check valve installed in the plumbing line between the chlorinator and heater to ensure chemicals do not flow into heater. After thinking about it it struck me as odd since he installed the heater to begin with and did not mention it at the time of install. Is the Rainbow 320 built in check valve sufficient or is a secondary check valve warranted? Have not had any issues with heater in 2 years since install. Thanks for your input. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted March 12, 2021 Report Share Posted March 12, 2021 Parts can fail, and it is not uncommon for flow to reverse momentarily at pump shut off, which could pull high chlorine concentrations into the equipment. Quote Link to comment Share on other sites More sharing options...
Paul3894 Posted March 12, 2021 Author Report Share Posted March 12, 2021 Seems like my spa return check valve fails every few years. My biggest concern on having one plumbed in is that if or when it fails it will result in more pipe cutting to fix. Pipes are already Frankenstein'd enough. Any experience on how long these fully contained chemical resistant check valves last? Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted March 12, 2021 Report Share Posted March 12, 2021 Get a jandy check valve with a removeable top. Or just get it installed with unions so it can be unscrewed. 1 Quote Link to comment Share on other sites More sharing options...
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