Get the Puratek one. After you factor in the pressure gauge and the booster pump, it is a decent deal. Probably one of the more efficient units available and from what I hear one of the few units that actually output water close to what it is rated at, I'm guessing that's due to the booster pump.
I bought a Bulk Reef Supply RO unit for my parent's drinking water, it works quite well. That'd be my second choice.
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