Membrane Solutions Water Filter Replacement, Gravity Controlled Flow, Carbon Block Replacement for Berkey Black System, Compatible with Stainless Steel Countertop Purification Advanced Features [2-Stage Filtration] – The Membrane Solutions U3-E gravity water filter system adopts a composite filter technology, can reduce most contaminants. The black carbon filter employs a 0.1μm hollow fiber UF membrane and an activated carbon block to reduce chlorine and intercept rust, sediment, organic matter and heavy metals, etc. [High efficiency filtration] Membrane Solutions U3-E gravity water filter is 0.1 microns so that it can filter out 99.9% tiny materials from the water while other brands’ filter pore size is only 0.2 microns. The smaller filter pore size, the higher filtering accuracy. It also can reduce heavy metal, sediment, chlorine, sand, rust, odor and large particles in source water, improving the taste of water. [Long Lifespan and Replaceable] – The Three carbon filters (black) can provide up to 3000 gallons/per filter drinking water, (According to different water quality, the lifespan of the filter elements would be a little different). But for optimum performance, the filter elements should be replaced every 6-8 months. [Compatible models] – Matches well with the original brand (BB)9-2 black purification element. Interchangeable with Travel, Big, Royal, Imperial and Crown Series and gravity filtration systems.Kit combines (BB)9-2 black purification element to absolutely reduce harmful substances from outdoor water sources. Operating Parameters Model Membrane Solutions U3 Material CB+CF composite filter technology Purification Method Carbon Block, Ultra Filtration Duration 3,000 gallons of water/per filter Membrane Pore Size 1 Micron (Activated Carbon) 0.1 Micron (Hollow Fiber) Contaminant Removal remove 99% of chlorine. Flow Rate 0.1L/Min (Filter Element) Item Weight 1.15kg(3pcs) Product Dimensions 9.72»Hx2.24»W(per filter) Compatible with Stainless-Steel Gravity Fed Countertop Water Filter System Compatible models for Berkey BB9-2 water filter, Berkey Gravity Filter System including Travel, Big, Royal, Imperial, Crown Series. Recommended for 4+ persons Package list: 12x CB+CF composite filter Replacements