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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Mike
150g reef, 55g sump, T5's, Vertech 200A, Profilux III - German made is highly over rated, should just say Gerpan made.
Reefkeeper - individual obsessed with placing disturbing amounts of electricity and seawater in close proximity for the purpose of maintaining live coral reef organisms.
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