Symptoms
- Water pressure dropped noticeably at every faucet
- Pressure was normal before the filter was installed or serviced
- Filter housing gauge (if present) shows a pressure difference
- Pressure improves briefly after a cartridge change, then fades again
Likely causes
- CommonClogged filter cartridgeSediment and debris build up in the cartridge over time, restricting flow through the whole system.
- PossibleWrong micron rating for your waterA cartridge rated too fine for sediment-heavy water clogs much faster than expected.
- PossibleHousing installed with a partial obstructionA leftover shipping cap, debris, or a misaligned cartridge in the housing can restrict flow.
- Less commonUndersized filter for household demandA filter rated below your household's peak water usage can bottleneck flow even when clean.
What to do
- Check the maintenance schedule and replace the cartridge if it's due or overdue.
- Note the replacement date somewhere visible so future clogging is caught earlier.
- Inspect the housing when the cartridge is out for any debris, cracked parts, or a stuck O-ring.
- Consider switching to a higher-micron (less fine) sediment pre-filter if your water has heavy sediment and cartridges clog quickly.
- Check your household's peak flow rate against the filter's rated capacity if pressure is still low with a fresh cartridge.
Tools and parts
- Filter housing wrench
- Bucket
- Towels
Whole-house filter replacement cartridgeSearch: “whole house water filter replacement cartridge [micron rating]”
When to call a pro
Call a plumber or water treatment technician if pressure stays low with a fresh cartridge, since the filter system may be undersized or another restriction may exist.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.