A relation has one and says it "only" requires remaking the air bubble every 18 months or more but he does a full cylinder drain down and arranges it when the HW has been used up, I've read of some who do it similar to the Megaflo just using that procedure where the level is only drained by ~ 25% or so, to the level of the T&PRV and the bubble still apparently lasts 9 months or more.
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