Whole house water filter systems are often referred to as central point of entry systems. This is because they are installed where your water supply enters your house so that incoming water is treated before it runs into the individual lines that supply water throughout your whole house. Our whole house water filter systems feature 6 stage filtration based on the KDF/GAC water filtration system. They are effective at removing odors, sediments, foul tastes, heavy metals and many other harmful contaminants. Whole house systems are more convenient and more cost effective than using multiple Point of Use (POU) filters throughout the house. - See more at: http://www.watercoolerboy.com/catalog.html#sthash.PKqnxWLF.dpuf