Mechanical particle filtration
How a Sediment Filter works
A first-stage barrier that catches sand, silt, and rust before they reach the rest of the home.
A sediment filter is a mechanical screen that physically blocks particles larger than its rated pore size, measured in microns. It's usually the first stage after water enters the home, catching sand, silt, and rust so they don't clog softeners, carbon beds, RO membranes, and appliances downstream. It removes particles only — not dissolved chemicals.
Typical cost: $50–$400 installed
How it works
A sediment filter is the simplest stage — a mechanical screen that physically blocks particles larger than its rated pore size, measured in microns.
It's usually the very first thing water hits after entering the home, because catching grit early protects softeners, carbon beds, RO membranes, and appliances downstream.
Cartridges are rated by micron size: a 5-micron filter catches fine silt, while a 50-micron filter only stops coarse grit. Filters are swapped when pressure drops.
The components inside
What each part does, in the order water moves through the system.
- 1Filter housingThe canister that holds the cartridge under pressure.
- 2Sediment cartridgePleated or spun media rated to a specific micron size.
- 3Pressure gauge (optional)Shows when the cartridge is clogged and due for a change.
Configurations & options
One sediment filter is not like another. These are the real choices that change cost, maintenance, and how well it fits your home — worth understanding before you get quotes.
- Spin-down vs cartridge
- A spin-down filter uses a flushable mesh screen you rinse out with a valve — reusable, low-cost, and great for coarse grit and rust on well water. A cartridge filter uses replaceable pleated or spun media that reaches much finer micron ratings but must be swapped when it clogs.
- Micron ratings
- The micron rating sets what gets caught: 25–50 micron stops coarse grit, 5–20 micron catches fine silt and cloudiness, and below 5 micron approaches very fine particulate. Too fine a rating on dirty water chokes flow and clogs fast — match the rating to your actual sediment.
- Point-of-entry placement
- A sediment filter is almost always installed point-of-entry, as the first stage after water enters the home, so it protects the softener, carbon bed, RO membrane, and appliances downstream from grit.
What it addresses
- Sand, silt, rust flakes, and other visible particles
- Cloudiness caused by suspended solids
- Does NOT remove dissolved chemicals, hardness, or odor
Common questions
- How does a sediment filter work?
- A sediment filter uses a mechanical screen or cartridge that physically blocks particles larger than its rated pore size, measured in microns. Water passes through; sand, silt, and rust are trapped. It's typically the first stage after water enters the home, protecting more expensive stages downstream. Cartridges are swapped when pressure drops.
- What does a sediment filter remove?
- It removes sand, silt, rust flakes, and other visible suspended particles, and clears cloudiness caused by them. It does not remove dissolved chemicals, hardness, odor, or taste — for those you need carbon, ion exchange, or reverse osmosis after the sediment stage.
- How much does a sediment filter cost?
- Typical installed range is $50–$400, making it the least expensive stage. Your real price depends on housing type and flow rate — get an estimate rather than a fixed sticker number.
- What micron rating do I need for a sediment filter?
- The micron rating sets what gets caught: 25–50 micron stops coarse grit, 5–20 micron catches fine silt and cloudiness, and below 5 micron approaches very fine particulate. Too fine a rating on dirty water chokes flow and clogs fast — match the rating to your actual sediment.
Pros & cons
Pros
- Inexpensive and simple — a few minutes to change a cartridge
- Protects every more-expensive stage that follows it
- Clears visible grit and cloudiness fast
Cons
- Only handles particles — no taste, odor, or chemical benefit
- Cartridges need regular replacement on dirty water
- Too fine a micron rating can choke flow
Best for
Any home (especially on a well or old pipes) seeing grit, rust flecks, or cloudy water.
Sizing basics
- Pick a micron rating: 5–20 micron for fine silt, 25–50 for coarse grit.
- Match the housing flow rate to your home's peak demand.
- A pressure gauge tells you when flow has dropped enough to change it.
Solves these water problems
Next steps
Know the tech and the options — now get a real price for your water, or find a vetted local pro to size and install it.
Sources
Explore other system types
Advertising disclosure
The Very Good Water Company earns a referral fee when we connect you with a local water-treatment professional. We are independent — we are not paid to rank or recommend any specific brand or product.