How often to replace the filter element?and how long the service life of different filter elements? 1.PP cotton PP cotton can be said to have the shortest service life of all filter elements, and it is generally necessary to replace it in time after 6-12 months of use. Because this filter element is the most likely to be polluted, in order to keep the water coming out of the water purifier clean, the filter element must be replaced diligently. 2. RO membrane Many high-end water purifiers use RO membranes as filter elements. The advantage of this filter element is that it has a long service life. Under normal circumstances, it can be replaced once every 2-3 years. 3. Ultrafiltration Remove macromolecular organics , colloids and bacteria from water . Retain beneficial minerals ,suitable for use in areas with better water quality, 18-24 months replacement. 4. Activated carbon Activated carbon filter is one of the most common water purifier filters and needs to be replaced once a year. Can use in Countertop water dispenser and Under sink water purifier This filter is matched with our designed waterboard which can replace the filter as usual when the machine is powered on. At the same time, 2 stages filter can achieve the filtering effect of multi-stage filter Combination of 2 filters: 1) PAC+PRO 2) RO+HPPC,etc. Maximum Gallon: 800G This style of filter cartridge can be made into PP, Actived carbon , RO and composite filter 0.0001 Micron Ro membrane filtration RO Filter Theoretical filtration degree can reach 0.001-0.0001 micron reject the bacteria and heavy metal in the water effectively . Material: DOW / CSM Filter service life: 24-36 months Working principle After the tap water enters , it passes through the RO membrane ,concentrated water grid , and water production grid Pure water and concentrated water flow out separately , no pollution