APLOS Clear 2-in-1 Replacement Cartridge Filter APLOS Clear is a compact DIY solution designed to improve the quality of your drinking water right under the sink. It features a 2-in-1 filter with a 0.5-micron carbon block and a 5-micron sediment cotton cartridge. This product is only a replacement cartridge filter for the APLOS Clear and does not include the filter housing.  Stage 1: Uses a 5-micron sediment cotton cartridge that is designed to remove particles and impurities from water. These cartridges are typically made from cotton, which is wound around a core to create a dense filter medium.  The primary function of this is to act as a pre-filter, removing larger particles before the water undergoes further purification processes via the 0.5 micron carbon block. Stage 2: Consisting of a 0.5 micron carbon block that uses activated carbon to remove contaminants from water. The0.5 micronrating indicates the size of the particles the filter can remove; in this case, it can filt