How to change a whole-house water filter safely
Main water off, pressure off, then swap.
Here's how to change a whole-house filter safely, and when it's better to book a plumber.
- Plain English
- From installers
- Free water report
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You're probably on this page because:
- Your water pressure is dropping
- Your filter is overdue
Here's the safe way to do it.
Steps
- Turn off the main water or the filter's bypass
- Release pressure at a nearby faucet
- Unscrew the housing and swap the cartridge
- Check the O-ring
- Turn water back on slowly and check for leaks
Our take
When to call a plumber instead
We've answered this question thousands of times, on calls, on installs and for the water companies we supply.
Cartridge filters are DIY-friendly. Backwashing tank systems are different: their media lasts years, and replacing it means draining the tank and handling heavy media. That's a plumber job.
Also call if the housing is stuck, cracked, or leaks after you tighten it. [Add model notes and video.]
Written by people who install these every day
20+ years in water. No fluff, just how it really works.
- 20+ years in water
- Our own patents
- We supply other water companies
- [Thousands] of systems sold
- Licensed installers
Written by [Name], [title], [20+] years in water treatment. Reviewed by [Licensed plumber name], license # [#]. Last updated [date]. Sources: listed under each "By the numbers" block and linked in the copy
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Questions people ask
How often to change a whole house water filter?
Cartridges every 3 to 12 months; tank media every few years.
How do I change a whole-house filter?
Water off, pressure off, swap, check O-ring, water on slowly.
Why is my housing stuck?
Pressure not released, or old O-ring.
Can I change tank media myself?
We recommend a plumber.
What if it leaks after?
Reseat the O-ring.
Can a plumber do it?
Yes.