I know some reviews claim a 2-1 ratio but if you read the instructions it says 1-to-1 70 psi is. I don't know my psi, but it seems close to 1 to 1 just observing the clear water exit rate and water runoff rate. The pre-filter pump jerkily pushes the waste out, but fresh water always flows well! I haven't had a chance to test this with my ph meter yet. but I bet it's ok.
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