001um UltraFiltration Under Sink Water Filter SystemMfr #: CU A4 SUPERIOR PERFORMANCE: The advance 4 stage design, which includes both Ultrafiltration and KDF GAC stages, removes up to 99% of chlorine and chlorine treatment by products, lead, and much more, while retaining minerals. Noted: This system is NOT a Reverse Osmosis water filtration system and does NOT lower TDS. 4 Stage ULTRAFILTRATION SYSTEM: PP Sediment Filter (5 microns) removes larger particles like rust, sand, dirt. Ultrafiltration