Sediment filter for well water: sand, silt and cloudy water
Buying through our links can earn us a commission at no cost to you. How that works.
Short answer
Use a spin-down screen for sand you can see, then a 5-micron cartridge for fine silt. The sediment filter always goes first in line, because it protects every system after it. If sediment suddenly gets worse, have the well checked: it can signal a failing screen or a pump set too low.
Which sediment filter fits
| What you see | Filter type | Notes |
|---|---|---|
| Grit or sand in faucet screens | Spin-down filter (for example 100 mesh) with a flush valve | Reusable; flush it weekly |
| Cloudy water, fine silt | Cartridge filter, 20 to 5 micron | Change when pressure drops |
| Both | Spin-down first, then a 5-micron cartridge | The spin-down extends cartridge life |
| Cloudy water that clears when it sits | May be air or very fine clay | Test turbidity before buying |
Our pick
-
Sediment + carbon + light iron in one system
iSpring WGB32BM 3-Stage Whole House Filter
Three cartridges in housings: sediment, carbon block, then an iron and manganese reducing cartridge. No backwash and no drain line, but you replace cartridges about once a year.
- Iron up to 3 ppm
- Manganese up to 1 ppm
- 15 GPM
- 5-micron sediment + carbon + iron cartridge
- ~100,000 gallons per stage
- 1" NPT
About $650includes a spare filter set · checked October 2026 Check price at iSpring
If you only need sediment control, a single big-blue housing with a 5-micron cartridge costs far less. The iSpring above makes sense when your test also shows light iron (under 3 ppm).
Sediment before UV
UV systems need turbidity under 1 NTU. A 5-micron cartridge right before the UV is standard practice.
Questions well owners ask
What micron sediment filter is best for well water?
Start at 20 or 25 micron if sediment is heavy, then 5 micron for fine silt. Going straight to a very fine filter on dirty water means changing it constantly.
Why did sand suddenly show up in my well water?
A worn pump, a damaged well screen, or a pump set too close to the bottom can all pull sand. A well contractor can check.