The 3M Water Factory Under Sink Replacement Filter is a compatible 3M replacement providing fresh, clean, and great tasting drinking water. This high-quality filter reduces sediment, dirt, and rust - polyfoam - scale. Filters are made with activated carbon produced using a new technology that carbonizes dried coconut shells. Coconut carbon is superior to other sources of activated carbon. It has 50% more micro-pores for capturing contaminants.