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USWF 20 Micron 10"x4.5" Melt Blown Sediment Filter - Whole House Cartridges - 9.72 - DiscountFilterStore.com

USWF-MB20-1045

USWF 20 Micron 10"x4.5" Melt Blown Sediment Filter

Name: USWF 20 Micron 10"x4.5" Melt Blown Sediment Filter
Brand: US Water Filters
SKU: USWF-MB20-1045
Price: 9.72 USD
Availability: InStock
Rating: 5.0 (1 reviews)

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$9.72

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2 PACK	$9.43
4 PACK	$9.14
6 PACK	$8.85
24 PACK	$8.55

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What's this?

Proudly manufactured in America supporting American workers and ensuring a high quality product.
4-layered filtration for improved efficiency and dirt holding capacity throughout the entire life of the filter.
100% melt blown polypropylene construction with no binders or adhesives.
Fits most standard 10" x 4 1/2" filter housings including Pentek, Culligan, American Plumber and more.

Features & Specs

Package Qty: 1

Manufacturer's Id: MB20-1045

Actual Size (in): 9 7/8 inches (length) x 4 1/2 inches (outside diameter)

Media: Melt Blown

Primary Filter Media: Meltblown Polypropylene

Operating Temperature (°F): 40 - 155

Brand: USWF

Advertised Size: 10 x 4-1/2

Length (in): 9.88 in

Outside Diameter (in): 4.5 in

Maximum Temperature (f): 155

Media Type: Sediment Filter

Country of Origin: United States

Micron Rating Nominal: 20

Flow Rate (gpm): 10.0

Instructions

Turn off water supply and release pressure in the filter housing. (Press red pressure-relief button on housing if present.)
Unscrew filter housing sump. (Use filter wrench if nessecary.)
Discard used filter cartridge. Remove the sump o-ring, wipe clean and set aside.
Wash housing with dish soap and warm water using a nonabrasive sponge or cloth. Rinse thoroughly
If unpleasent odor is present disinfect filter housing. Fill 1/3 with water. Add about 1 tablespoon of bleach and scrub to disinfect. Rinse thoroughly
Lubricate o-ring with clean silicone grease and place back onto the sump housing. (Check for cracks or imperfections on the o-ring while lubicating, and replace o-ring if damaged.)
Insert new filter cartridge ensuring that it is seated properly in the sump housing.
Screw the sump housing back onto the cap and hand-tighten. Do not use the filter wrench to prevent over tightening.
Turn on the water supply and check for leaks before leaving the installation.
Flush out any air from the filter housing. (Using the red pressure-relief button, or a nearby down-stream faucet.)

Contaminants Reduced

Dirt

Sediment

Silt

Coarse Sand

Filter Life

Filter Life (months): 6 months

Check Our Comparable Products

Product Details

USWF-MB20-1045 is a 20 micron 10"x4.5" melt blown sediment replacement filter that is proudly manufactured in the USA. It is made from FDA Title 21 compliant 100% melt blown polypropylene and doesn't use any surfactants, binders, or adhesives to create an exceptional product independently tested to NSF / ANSI standards 42, 61, and 372.
USWF melt blown filters utilize staged depth loading for maximum dirt holding and filter efficiency. The outermost layers of the filter are made of larger fibers to trap larger particles while the innermost layer traps the fine particles down the filter's micron rating. Most of the competition only has 3 stages of filtration, but USWF melt blown filters include an additional layer. This fourth layer of filtration provides a more consistent distribution of dirt through the filter improving its efficiency without sacrificing any dirt holding capacity.
This American made filter is a compatible replacement for other popular polypropylene sediment filters like the Hydronix SDC-45-1020, Watts FPMB-BB20-10, and more.
Proudly made in America

Choosing American-made products means investing in quality you can trust, while also supporting jobs and communities across the United States. American manufacturing is held to strict quality and safety standards, ensuring durable, reliable products built to last. By buying domestically, you help strengthen the U.S. economy, support local workers, and reduce reliance on overseas production. Plus, with shorter supply chains and lower transportation emissions, American-made goods contribute to a smaller environmental footprint - making it a smart choice for both performance and sustainability.

Interested in reading more about US-made products and what we offer? Read our article, Why Buy American Made Filters?

Frequently Asked Questions

What is the micron rating of the USWF 20 Micron 10" x 4.5" Melt Blown Sediment Filter, and what does it remove?

The USWF Melt Blown Sediment Filter has a 20-micron rating, making it ideal for capturing larger sediment particles such as sand, silt, rust flakes, dirt, and scale from your whole-house or well water supply. Constructed from 100% pure polypropylene with a graded density structure, this filter traps coarse particulates on the outer layers while finer debris is captured closer to the core, maximizing dirt-holding capacity and extending service life compared to standard spun filters.

What are the exact dimensions and which housings is this USWF filter compatible with?

This USWF sediment filter measures 9.75–10 inches in length and 4.5 inches in outer diameter, commonly referred to as a "Big Blue" size. It fits standard 10" x 4.5" whole-house filter housings from brands such as Pentek, Culligan, American Plumber, GE, KleenWater, and most other housings that accept a 10" Big Blue cartridge. Always verify your housing's inner dimensions before installation to ensure a proper seal.

How often should I replace the USWF 20 Micron 10x4.5 Melt Blown Sediment Filter?

For optimal performance, the USWF 20 Micron Melt Blown Sediment Filter should be replaced every 3 to 6 months, depending on your incoming water quality and household usage. Homes with well water or visibly high sediment content may require replacement as often as every 2 months, while municipal water users with lower sediment levels can often extend the filter to the full 6-month cycle. A noticeable drop in water pressure is a clear indicator that replacement is due.

Is the USWF 20 Micron Melt Blown Sediment Filter NSF certified and safe for drinking water applications?

The USWF 20 Micron Melt Blown Sediment Filter is manufactured from FDA-compliant, 100% pure polypropylene materials tested against NSF/ANSI Standard 42 criteria for material safety, ensuring it contains no binders, adhesives, or surfactants that could leach into your water. It is safe for use as a pre-filter in potable drinking water systems, and works well as a sediment pre-filter ahead of RO systems, UV sterilizers, or carbon filters to extend their lifespan.

Can the USWF 20 Micron Sediment Filter be used as a pre-filter for a reverse osmosis or whole-house system?

Yes, the USWF 20 Micron 10x4.5 Melt Blown Sediment Filter is an excellent pre-filter choice for whole-house systems, reverse osmosis units, UV disinfection systems, and water softeners. By removing coarse sediment before water reaches more sensitive downstream filtration stages, it protects finer carbon blocks, RO membranes, and UV lamps from premature fouling—reducing overall system maintenance costs and improving long-term performance.

Comparable Part Number

USWF 20 Micron 10"x4.5" Melt Blown Sediment Filter

Frequently Asked Questions

USWF-MB20-1045 is comparable with the following part number(s)

Customers Also Purchased

	USWF 20 Micron 10"x4.5" Melt Blown Sediment FilterFrom $9.72	FPMB-BB20-10 Watts Flo-Pro Whole House Water Filter CartridgeFrom $27.46	10 inch x 4.5 inchSediment Water Filter by Tier1 (20 Micron)From $13.14
Product Price	$9.72	$27.46	$13.14
Product SKU	USWF-MB20-1045	WATTS-FPMB-BB20-10	TIER1-P20-10BB
Filter Life (months)	6 months	6 months	6 months
Primary Filter Media	Meltblown Polypropylene	Polypropylene	Polypropylene
Micron Rating (Nominal)	20	20	20
Actual Size (in)	9 7/8 inches (length) x 4 1/2 inches (outside diameter)	9-3/4 (length) x 4-1/2 inches (outside Diameter)	10 inches (length) x 4-1/2 inches (outside Diameter)
Country of Manufacture	United States	—	—