The Avalon 4 Stage RO replacement water filters are suitable for Avalon Bottleless Reverse Osmosis Water Coolers. It consists of 4 filters. An NSF certified sediment filter (listed as model Avalon A5FILTER) to filter out any rust or large particles of dirt in the water. A pre-carbon filter. An RO membrane filter to lower the TDS in your water. A post carbon filter (listed as model Avalon A4FILTER) which will eliminate chlorine, lead, rust, bacteria, or any harmful or unwanted minerals from the tap water that flows through it. The filters can be easily replaced into the cabinet of the water cooler. The filters have a capacity of 1,500 gallons of water and is made to last for 6 months of use. They have a flow rate of 0.5 gallons per minute. All filters must be used together. Your water will be tasting crisp and pure with these installed in your water cooler. | Avalon | | Filters | White | Best Buy