Filter #1 - PP Sediment Filter to remove sand, silt, colloid and any other sediment with a diameter more than 5um in feed water. (Sediment particles like sand, algae and rust are removed). Filter #2 - Block Carbon Filter to adsorb odor, chlorine and other contaminants. Carbon block is a finer grade of carbon for removal of contaminants. Filter #3 - Ultra-Filtration membrane to remove pathogens and bacterium from water by using physical barrier filtration. Filters down to 0.01 Microns. Ultra-filter membrane filters all particles > 0.22 Micron (0.00022 mm) in the water. This stage removes again remaining germs, protozoa, algae, spore etc. (In regular store hard to find, but used in the industry for the purification of mineral water. Ultra-filters are also used for drinking water purification in disaster areas, for instance by THW). Filter #4 - Post Carbon Filter to adsorb odor and “polish” the water for a sparkling taste. PI activated carbon filter "Gourmet" made of high-quality granular coconut activated carbon with large surface. This filter removes unpleasant smell and taste, leaving a pure refreshing water. Microns: 0.1 - 0.01 Working temperature: 41-113 F Size: 213 x 213 x 393 mm Water Flow: 1.2 L/M Warranty: 3 Years Filters need to be replaced every 6 months.