Once you tap into the proprietary technology of Alexapure Pro. you will never worry about the safety of your family’s drinking water again. When it’s time to change your gravity core filter. don’t accept anything less than authentic Alexapure Replacement Filters. This will ensure that you get the highest quality result from your Alexapure Pro Water Filter System (PU3773). Each filter has a capacity of up to 5.000 gallons. depending on the quality of your water source and is ready right out of the box with no priming necessary. The filter features proprietary gravity block ionic adsorption technology. and the silver-impregnated ceramic outer shell multiplies filtering power. Groundbreaking engineering allows for the removal of up to 99.9999% of sediment. bacteria. lead. pesticides. chromium. heavy metals and chlorine. The filter is certified to NSF/ANSI Standards through Envirotek Laboratories and uses FDA approved materials. The filter is 100-percent made in the USA.Designed for Use with the Alexapure Pro Water Filtration SystemRemoves up to 99.9999% of all heavy metals. pesticides. volatile and semi-volatile compounds. cysts and bacteriaFilter Capacity of up to 5.000 GallonsUse up to 4 Filters for Increased Flow RateReady Right Out of the Box – No Priming Necessary