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I'm looking for input on whats the best bang for the buck RO/DI filters? I know alot of people have these running on there systems so I'm looking for input on which one to go with. My game plan is to direct connect it to my 180 gallon freshwater system and use it to fill my saltwater mixing tub to do water changes on my 175g reef tank. So what all do you guys have hooked up and whats the recommendation?