Quote:
Originally Posted by andestang
I have the same Vertex RO/DI unit and I notice your middle chamber also has air in it. While its running have you ever bleed(loosen the clear canister then retighten) the air out and notice how much better it runs ? I find the booster pump cycles on and off lots untill I bleed the air out and also my TDS readings will also fall. I'm sure that it is not normal for the air to be in there, if the unit is sealed properly where would it come from, what do you think ? As a note I've been sent a new canister, o-ring and mounting plate with no change.
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If the are gets lower then it is now I usually bleed it so not as much air goes through the booster pump. After I bleed mine their wont be any air in it till I change either the carbon or a sediment filter. Mine still sometimes runs really loud though even when there is no air in it.