Use this as the first filter before the P4.5-10 NanoCeram ultra filter.These are gradient density for longer life, string wound sediment pre-filters. There are three layers of filtration, outer layer is 20 micron, second layer is 5 micron and the inner layer is 1 micron. NSF component, shrink wrapped for purity with the micron rating molded into the cartridge.
Price shown includes 4 filters.