Typical point-of-entry layout
A whole-house system is normally placed after the service shutoff or well pressure equipment and before the plumbing branches, following the manufacturer layout. Treatment order, bypass design, water-heater placement, drain, power, and backflow requirements vary by system and jurisdiction.
The planning sequence
- Confirm the water report and exact treatment train.
- Check rated flow, pressure limits, pipe size, pressure drop, service clearance, power, drain, temperature, and environment.
- Plan isolation valves, unions, bypass, supports, gauges, pressure control, and grounding continuity as required.
- Install in the documented flow direction without loading the housings or heads with pipe weight.
- Flush, sanitize, leak-check, purge air, and commission exactly as the manuals direct.
- Record baseline pressure and verify treated-water performance with the appropriate follow-up test.
Jobs that should stop the DIY plan
- Unclear electrical bonding or grounding continuity.
- A pressure vessel, UV electrical system, backwashing drain, or chemical feed.
- A well with confirmed microbial contamination or a health-standard exceedance.
- No workable bypass, service clearance, or freeze protection.
- Permit, backflow, seismic support, or potable-material uncertainty.
Keep the bypass from becoming a silent failure
Sources
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