Universal 10" x 2.5" reverse osmosis pre-filter replacement cartridges with a 10" x 2" Post inline carbon filter and a standard 1.8" x 12" reverse osmosis membrane. Fits almost standard sized 5 or 6 stage reverse osmosis systems. Includes Ispring, Watts, Premier, Flowmatic, PuROLine, Crystal Quest, Puromax and more brands. This filter set includes: (x2) 5 Micron coconut shell carbon block filter (x1) 5 Micron polypropylene sediment filter (x1) 50 GPD Reverse Osmosis membrane (x1) 10" inline granular activated carbon GAC post filter, 1/4" inch NPT thread inlet & outlet CARBON BLOCK FILTER IPW Industries Inc carbon blocks are manufactured with a high purity Coconut Shell Activated Carbon. Our acid washed carbon blocks activate the carbon to make it more porous and able to remove more contaminants than standard water washed carbon. With a high chlorine reduction, great dirt-holding capacity, and greatly reduced carbon fines, you will soon make our Carbon Blocks your preferred choice! SEDIMENT FILTER Economical light weight filters for standard 10" housings. IPW Industries Inc sediment filter cartridge's coreless design is an economical solution to pre-filtration for many applications. These are used widely as pre-filtration for RO systems and whole house filtration for high sediment water sources. They are also used in applications such as Ice Machines, Film Processing, Beverage, Coffee, Analytical, Wineries, and many others. REVERSE OSMOSIS MEMBRANE 50 GPD RO Membrane - Standard 1.8" x 11.75" Dimensions NOTE: THE LAST STAGE POST CARBON IS 1/4" NPT THREAD INLET AND OUTLET