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What is the difference between POU and POE?
There are only two locations ("points") you can install a water treatment system: Point-of-Entry and Point-of-Use. Which of the two systems you need depends upon what you hope to accomplish?
Point-of-Entry Water Treatment (POE) is installed at the point where the supply enters the house and it is connected to the house water meter. This kind of water systems, treats the water for your whole house. Point-of-Entry water treatment system is installed on your side of the meter with the purpose of treating all of the incoming water before it goes into the individual supply lines that feed your laundry, bathrooms, dedicated outside faucets and others as well as your kitchen. POE systems often include softeners, large bed carbon filters, and some systems which are specifically designed to remove sediment, tastes and odors.
Point-of-Use Water Treatment (POU) is installed in an individual source line ahead of any or all of the taps, faucets or other dedicated outlets used to dispense water for drinking, cooking or bathing. POU systems are often a combination of pre-filter, RO filter and post-filter to capture whatever escapes the POE system.