450GPD Reverse Osmosis Water Fed Pole Window Cleaning Replacement Filters with membranes. Sediment- polypropylene foam filter cartridge removes sand, rust, silt and other sediments up to 5 Micron. Filter cartridge with granular activated carbon and non-woven polypropylene material, removes chlorine and organic compounds Filter 3. The carbon is formed in specially pressured, high density blocks to gain high adsorption rate of chlorine, other chemicals and multi particle organic substances. Quick and easy to install.