AquaShield Triple Filter 3000 & 4000 Series combines the heavy duty Commercial Industrial prefiltration for our superior Reverse Osmosis PPVM Systems with the unique AquaShield Antimicrobial Filter Series, an antimicrobial within it to inhibit bacteria, virus, algae, fungus, mold and associated odors and allows you to customize efficiencies based upon your needs through the capacity to select among our superior quality cartridges.