You'll need a 5 micron filter and carbon filter. I think mine runs 5micron/carbon/5micron (or even a 1 micron)/RO/DI but I originally got some sort of "coconut" filters for the secondary 5 micron. As long as you have some sort of particulate filter and a carbon before your RO you're fine.
Depending on your water quality your RO can last a few years. I changed out mine last year after running it for almost 4 years. The water wasn't bad coming out of it, I just thought it was time and they were on sale.
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