We offer competitively priced Reverse Osmosis membrane, sediment, carbon block and inline carbon combo packages (and all of the packages in this group have Free Shipping). RO membranes are available in 24, 35, 50, 80, 100 and 150 gallons per day sizes. Filters are standard size 10" x 2.5". Click on the wording below the picture of the combo package you would like to purchase (or click on "view all" to see all of the items in this section) and you will be transferred to the proper page.