Which size RO/DI unit?

[Kaimana969]

We will be setting up a 120 gallon reef tank. I'm looking at the BRS RO/DI unit and need to get the 6 stage unit. Should I get the 150 GPD unit or the 75 GPD unit which has a drinking water attachment which we wouldn't use (however it is cheaper).

 

[BillyOcean]

Only difference is the 150 has 2nd ro membrane...which will make your waste:ro/di about 1:1. For an extra 30 bucks...go 150. Basically you will make abt a gallon of Rodi per 3-4 gallons of waste With one ro membrane. With two...about one to one

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[Kaimana969]

Ok thanks. I guess I was looking by at why we would want a system that makes more sense after than I need, but I guess it's more about the add-one that you get with that system.