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Joined: Oct 2014
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Joined: Oct 2014
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Many membrane diffusers have built-in checkvalves. One should verify the built-in check valve feature when shopping for the various types or styles of diffusers. Some have them some don't. Bill, I don't recall ever reading why a diffuser needs a check valve. I guess I assumed it was to keep water out of the air supply line so ice cannot form in the line at the iceline in the pond during winter; making it impossible to aerate during the winter. Is that the reason or is it something else?
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