As for the RO units on Ebay, they are pretty good. One friend has had one for about a year, and with his recommendation, another friend of mine bought one. They both are extremely happy with them. The both use them for their reef tanks.
Keep in mind, though, that those RO units have rated their gallons per day at like 60psi. You're not going to get 60 psi out of any of the faucets in your house. So doing 80-100 gal a day isn't in your future. Took one of my friends 4 days to fill his 75 gallon.
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