I have a coralife 25 gpd RO unit that is just collecting dust in my basement. It is a 3 stage: sediment filter, carbon filter, and RO membrane. The sediment and carbon filter could use a change soon, but probably still have 100 gallons of life left. The RO membrane has about 9 months of use with maybe 500 gallons, so it should have several years of life left. PM me if interested.
