Learning Center
How Whole-House Water Filtration Works
By North DFW Water Editorial Team · Published 2025-01-01
A plain explanation of prefilters, media, sizing, and how whole-house systems are put together.
What 'point of entry' means
A whole-house — or point-of-entry — system treats water where it enters your home, so filtered water is available at every fixture: showers, laundry, kitchen, and outdoor spigots on the treated line.
Typical stages in a whole-house system
- Sediment prefilter — captures particulates that would otherwise foul finer media.
- Primary media — commonly activated carbon for chlorine, taste, and odor.
- Optional specialty media — for specific concerns identified in your water.
- Optional softening or UV stages — when appropriate for your source.
Why sizing matters
Whole-house systems are sized to your home's peak flow rate. An undersized system can restrict pressure or fail to provide adequate contact time; oversized systems cost more without added benefit.
Ongoing maintenance
Sediment prefilters are periodic. Tank-based media systems can last years between media changes depending on water quality and use. Manufacturer guidance sets the schedule.
Editorial disclaimer: This article is general education. System recommendations should be based on your home's water source and conditions. Sources:
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