A lot of this depends on the ...

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A lot of this depends on the ultimate use of the filtrate, reject and permeate. You can make the output from a MF much cleaner so that you use less energy in an RO and get cleaner reject and permeate from the RO with a lot less total energy and possibly end up with a usable filtered solids. The ultimate answer to green is what do you mean? Plugging a nano is not any better than plugging an RO. Neither becomes very green when you need to clean.  The rhymes will help you as silly as they are.