Euro-Plus.net recommends the Premium Refill Filter Cartridge by Kohler from eFaucets. Kitchen Accessories. As an associate publisher, we cannot guarantee the availability of the suggested Replacement Filters Invest in pure water by placing the Aquifer filtration system discreetly underneath sink. filter cartridge quickly twists in and out with a quarter turn, making it easy to replace. For use with Aquifer water filtration system. Single stage filtration.