I have had two units 1was a cheaper ro/di no booster pump no tds meter and none of the nice features this unit has ,when the filters prematurely exhausted because of the low water pressure ? ( I think) I bought a tds meter then looked at buying a booster pump and I would have ended up spending up around 200$ to upgrade ,I ended up buying the vertex unit instead of all the other stuff and I am so glad I did ,it just works so nice really it's just plug and play pretty much I wish I would have just bought it first I would have saved myself a bunch of money
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