The Dewberry system doesn't use just any ordinary filter cartridge. It uses a 3-stage system to ensure the cleanest, tastiest water. In the first stage, particles are removed from the water through a fine mesh. Next, water goes through activated carbon with antibacterial silver impregnation which absorbs chlorine, organic impurities, and pesticides. Finally, waater passes through an ion exchange resin which reduces hardness and removes toxic metals. The result is clean, delicious-tasting water.