There are essentially only two principle locations for installing water treatment systems. Which of the two systems you need depends upon what you hope to accomplish. One is Point-of-Entry water treatment (POE), the other is Point-of-Use water treatment (POU). What's the difference?
A Point-of-Entry water treatment system is installed on your side of the meter with the express purpose of treating all of the incoming water before it goes into the individual supply lines that feed your laundry, bathrooms (including toilets), 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 (or trap) sediment, foul tastes and odors. POE systems are sometimes considered pre-filters.
A Point-of-Use water treatment system is installed in an individual source line ahead of any or all of the building's taps, faucets or other dedicated outlets used to dispense water for drinking, cooking or bathing. Good POU systems are often expected to capture whatever escapes the POE system.
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