Detailed Product Description Stage 1 5 micron Filter to Remove Large Particles: Removes dirt, sediment, sand and other physical particles.Stage 2 Carbon Block: Reduces chemicals, such as chlorine, that might be found in ones drinking water supply.Stage 3 Carbon Block: Further reduces chlorine, odors, and other chemicals that might be in your water supply.Stage 4 Reverse Osmosis Membrane: Thin ...