1xCountertop Reverse Osmosis Water Filter,1xuser manual,1xwarranty card 1xCountertop Reverse Osmosis Water Filter,1xuser manual,1xwarranty card. Countertop Design+Installation-Free: The reverse osmosis water filter no installation or plumbing is required — all you need to do is plug the water purifier into any power outlet and flush twice,then you’re ready to fill it up and ready to use.