Many homeowners with under-counter filtration systems need to replace a horizontal Pur water filter because space is tight and access is awkward.
This guide walks you through safe, reliable steps so you can swap the filter without damaging the housing or wasting water.
| Filter Model | Approximate Flow Rate | Recommended Replacement Interval | Compatible Housing Types |
|---|---|---|---|
| Pursell II | 0.5 GPM | 6 months | Standard 10-inch |
| Clothington SX | 0.4 GPM | 9 months | Compact under-sink |
| Hydro Shield 10x2.5 | 0.6 GPM | 12 months | Narrow under-counter |
| Pur Plus Carbon | 0.5 GPM | 6 months | Standard 10-inch |
Horizontal Filter Orientation Challenges
Why Horizontal Layout Matters
In many installations, the Pur water filter sits horizontally to fit under low cabinets or beside a small water heater.
This orientation can make cartridge removal seem difficult, but the right technique keeps your workflow smooth.
Shut Off Water and Drain Residual
Safety and Cleanup Steps
Before touching the filter, turn the cold water supply valve clockwise and open the faucet to drain pressure.
Place a shallow tray beneath the housing to catch any remaining water and prevent cabinet damage.
Access and Remove the Old Horizontal Filter
Tool-Free Removal Method
Locate the retaining clips or thumbscrews on the filter holder and loosen them by hand.
Gently pull the horizontal Pur water filter toward you, angling it upward to avoid drips.
Install the Replacement Filter Correctly
Orientation and Sealing Tips
Check that the new filter matches the flow direction arrow, usually pointing toward the faucet.
Insert it firmly into the housing, then tighten the clips or screws evenly to prevent leaks.
System Check and Performance Verification
Testing for Leaks and Flow
Slowly restore the water supply while holding the faucet open to purge air from the system.
Inspect the joints for drips, run water through the dispenser, and confirm pressure and taste meet expectations.
Key Takeaways for Horizontal Pur Filter Replacement
- Always shut off the water supply and drain pressure before servicing.
- Match the filter orientation to the flow arrow inside the housing.
- Use even pressure on clips or thumbscrews to avoid cracking the housing.
- Flush the system briefly after installation to clear carbon fines.
- Note the replacement date and schedule future changes proactively.
FAQ
Reader questions
How do I remove a tight horizontal Pur filter without damaging the housing?
Soak the end of the filter in warm water for a minute, then grip the housing with a rubber mallet handle and twist slightly while pulling the filter straight out.
Is it safe to flush air through the system immediately after installation?
Yes, run cold water steadily for two to three minutes to clear carbon dust and stabilize flow without stressing the seals.
What should I do if the replacement filter leaks at the connection?
Turn off the water, dismount the filter, check the gasket for proper seating, and gently re-tighten the adapter to the manufacturer’s torque spec.
How can I track when to replace the horizontal Pur filter next time?
Mark the calendar or set a reminder for six to twelve months from the date of installation based on your household usage and the model’s spec sheet.