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Point of Entry System

A point of entry (POE) system treats water at the main supply line as it enters a building, improving water quality for every faucet, fixture, and appliance. POE systems can remove sediment, chlorine, metals, or bacteria and are often implemented as whole-house filters, water softeners, or UV treatment systems. They differ from point-of-use systems, which treat water at a single faucet or appliance.

💡 Key Takeaways

  • A point of entry (POE) system treats water at the main supply line as it enters a building, improving water quality for every faucet, fixture, and appliance. POE systems can remove sediment, chlorine, metals, or bacteria and are often implemented as whole-house filters, water softeners, or UV treatment systems. They differ from point-of-use systems, which treat water at a single faucet or appliance.
  • POE systems should be sized based on flow rate and household demand.
  • Professional installation is usually required to modify the main supply line.
  • Regular media and filter changes keep treatment effective.

Point of Entry System

/pɔɪnt əv ˈɛntri ˈsɪstəm/

Definition

A point of entry (POE) system treats water at the main supply line as it enters a building, improving water quality for every faucet, fixture, and appliance. POE systems can remove sediment, chlorine, metals, or bacteria and are often implemented as whole-house filters, water softeners, or UV treatment systems. They differ from point-of-use systems, which treat water at a single faucet or appliance.

What does a point of entry system do?

It treats all water as it enters the building so every fixture receives filtered or softened water.

Source: The Cooling Company

Whole-house point of entry water treatment system

Quick Facts

Main water lineInstalled at
Whole buildingTreats
Filters, softeners, UVCommon types
Better water everywhereBenefit

How Point of Entry System Works

Infographic comparing point of entry and point of use systems

POE treats all incoming water; POU treats a single outlet.

Real-World Application

A family with hard water installs a whole-house softener at the entry line to reduce scale buildup and improve water quality throughout the home.

Pro Tip

Test your water before selecting a POE system so the treatment matches your specific contaminants.

Test your water before selecting a POE system so the treatment matches your specific contaminants.

TCC HVAC Team (Licensed • EPA-Certified)
The Cooling Company2026-09-11T16:42:47.654Z

Important Things to Keep in Mind

  1. POE systems should be sized based on flow rate and household demand.
  2. Professional installation is usually required to modify the main supply line.
  3. Regular media and filter changes keep treatment effective.

Did You Know?

POE systems protect appliances like water heaters and dishwashers by reducing scale and corrosion.

FAQ

Do I need a POE system if I already have a sink filter?

A POU filter only treats one outlet; POE treats all water entering the home.

How often do POE filters need replacement?

It depends on water quality and usage, but most require periodic changes every few months.

Will a POE system lower water pressure?

If properly sized, pressure loss is minimal. Undersized systems can restrict flow.

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