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Reverse Osmosis

Wide open question....

What do you expect from a system?
Do you want RO water on demand?... if so you need a system with a holding tank (aka accumulator tank, captive air tank etc.)
Do you want as low of TDS as possible?..... if so you need a DI stage
What flow rate do you want?.... this will help determine recovery times
Will your system also be used for personal consumption?
Are brine rates (waste water) an important consideration to you?
Is prefilter life an important consideration?
Will the installation be permanent or do you need portability?

etc etc etc....

There are some very detailed and longggggggggggg threads already on the subject :)

Much depends on what you want out of the system, what is "reasonably good" is a very individualized decision.
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