I would still consider the BRS, Marine Depot or equivalent system over this. Replacement cartridges are better and cheaper overall. Like I said, I dont know how good this RO buddy is... and I am thinking you will want a better sediment filter cartridge than this may provide. Also highly suggest a TDS meter for in line testing of before and after filter. 2 stage.. about $20 at BRS.. I only suggest them as they are local to me and I have met a few of their people.. Good people..