Sediment Filter for Well Water: Types, Micron Ratings and Setup
A sediment filter is the cheapest, most useful first stage on almost any well. Here's which type and micron rating to choose, and when too much sand means the well itself needs attention.
Types
| Type | Best for | Upkeep |
|---|---|---|
| Spin-down screen | Sand and grit | Open the flush valve; reusable screen |
| Cartridge (pleated or spun) | Silt and fine particles | Replace cartridges |
| Backwashing media filter | Heavy sediment, larger homes | Automatic backwash, needs a drain |
| Centrifugal separator | Lots of heavy sand | Periodic purge |
Choosing a micron rating
- Lower micron = finer filtering, but faster clogging and more pressure loss.
- Two stages (coarse, then finer) last much longer than one fine filter.
- Before UV, a 5-micron or finer filter is commonly required. Ohio's rule requires one.
Installation tips
- Put it first in the treatment line, before iron filters, softeners and UV.
- Add shut-off valves and a bypass so you can change cartridges without draining the house.
- Fit pressure gauges before and after. A growing pressure drop means it's time to clean or replace.
- Use clear housings if you like to see what's being caught.
A sediment filter only catches particles. For clear water that stains later, see iron.
Frequently asked questions
Do I need a spin down sediment filter for well water?
If you get sand or grit, yes. A spin down filter catches it and flushes out with a valve, and it protects the cartridge filter and other equipment after it.
What micron sediment filter is best for well water?
There’s no single best. Many homes use a spin-down screen for sand, then a cartridge around 20–50 micron, going finer only if needed. Very fine cartridges clog fast and drop pressure. Before a UV unit, a 5-micron filter is commonly required.
Should the sediment filter go before or after the pressure tank?
Commonly after the pressure tank, at the start of the house treatment, so it sees steady pressure and is easy to service. For heavy sand, some installers add a separator closer to the well to protect the tank. Follow your installer’s advice.
Will a sediment filter remove iron?
Only iron that is already rust particles. Dissolved (clear-water) iron passes straight through and needs an iron filter or softener.
Sources
- Ohio Admin. Code 3701-28-15 (private water treatment, UV requirements), State of Ohio
- Private Drinking Water Wells, U.S. EPA
- Turbidity in Drinking Water (fact sheet), Government of Manitoba
- Iron and Manganese in Private Water Systems, Penn State Extension
Sources checked October 24, 2026. Found an error? Tell us and we will fix it.