I have the 100GPD "Home" use one which comes with the 2.8G (or something like that) resevoir as well as the faucet. Which one you get really depends on what you want to use it for. I got the home one because I also drink that water. If you only want it for your Reef, then get the one that doesn't include the storage water tank. It will take up much less room under your sink. The R/O storage tanks is about the same size as a propane tank.
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