This BevGuard® brand filter contains a 0.5 micron compressed carbon block andpolyphosphate scale inhibitor. The carbon block provides tremendous capacity toreduce impurities and sediment that may be present in your drinking water. Thecarbon block has millions of active sites on its surface and within the structure whichcan absorb impurities like a sponge, and can attract and hold other types of impuritiesto its surface like a magnet. Additionally, this filter can catalytically breakdown otherimpurities very similar to the way a catalytic converter works in your automobile. Thescale inhibitor reduces the accumulation of minerals that lead to hard water spotsfrom lime scale build up on equipment. These processes ensure that you are gettingthe cleanest and best tasting water possible.This patented BevGuard® filter requires NO ACTIVATION, is economical and willprovide you with months of protection in any beverage or food equipmentapplication.