Save with Auto-Ship

Get the product you need, exactly when you need it, delivered right to your door. No more searching for the right part number, we've got you covered. Plus, you'll save $$ on every order and shipping is on us. Learn more

Save Money

Free Shipping*

Choose Frequency

*Free Shipping available in the contiguous US

10 X 4.5 Granular Activated Carbon Replacement Filter by Tier1 (25 micron)

Price $25.99 List Price Price $36.99 Save 29%
Availability: In Stock
Fits most stand housings built for 10-inch x 4.5 inch filter cartridges
Choose a quantity
  • 1Filter$25.99 
  • 3Filters Price $24.45 each
  • 6Filters Price $23.39 each
Available Add-Ons

SKU: TIER1-OR-LUBRICANT-LG › See more product details

Dow Corning Molykote 111 O-Ring Silicone Lubricant (5.3 oz. Tube)

Add: $39.99 $27.99

SKU: TIER1-OR-100 › See more product details

American Plumber, Culligan, Pentek OR-100 O-Ring for Big Blue Housings

Add: $9.99 $6.99
  • Ships fast!
  • Ideal for under sink or point-of-use filtration
  • Drop-in cartridge makes filter change fast and easy
  • Easy installation and filter exchanges within minutes
› See more product details
  • Ships fast!
  • Ideal for under sink or point-of-use filtration
  • Drop-in cartridge makes filter change fast and easy
  • Easy installation and filter exchanges within minutes

Tier1 RFC20-934 Filter Advantages

The Culligan RFC-BBS-D comparable by Tier1 is a 10 x 4.5 inch whole house radial flow carbon water filter for point-of-entry residential applications that require reduction of sand, hard scale, rust and corrosion, dirt, chlorine, bad taste and odor. Granular Activated Carbon filter media headlines this 25 micron radial flow filter that will meet your filtering needs head on. Order today!

Universal Sized Filter

The 10 X 4.5 granular activated carbon replacement filter by Tier1 is built to fit 10-inch x 4.5-inch filter housings. This standard sizing allows this filter to easily replace existing styles of whole house filters for housings requiring 10 x 4.5 inch filters. The RFC20-934 goes to work immediately providing cleaner, fresher water for up to three months. Enjoy cleaner better water with your whole house replacement filter today.

Carbon Filter Media

Carbon media, whether as granular activated carbon or as a carbon block functions as a fantastic water filtration media due to its incredibly high porosity. This high porosity maximizes the surface area contaminants are exposed to and ensures that contaminants have a great chance of being captured and reduced from your drinking water. Carbon filters are known for being effective at reducing the unpleasant taste and odors associated with city water chlorine treatment. If you are looking for better tasting water with excellent contaminant reduction try out a carbon filter today!

Package Qty1
Used In Brands3M, American Plumber, Aqua-Pure, Culligan, Flow-Max, Grainger, Hydronix, Keystone, OmniFilter, Pentek, Tier1
Manufacturer's IdRFC20-934
Advertised Size (in)10 x 5
Actual Size (in)9 3/4 inches (length) x 4 1/2 inches (outside diameter)
Actual Size (cm)24.765 x 11.43
Outside Diameter (inches)4.5
Media 20 Micron Polyethylene Outer Shell with Polypropylene End Caps; Spun Polypropylene Core; between the outer shell and inner core is a bed of Granular Activated Carbon
Primary Filter MediaGranular Activated Carbon
Filter Life (gallons)5,000
Filter Life (liters)18,927.1
Filter Life (months)3 months
Micron Rating (Nominal)25
Flow Rate (gpm)2
Flow Rate (lpm)7.57082
Country of ManufactureChina
Warranty GuaranteeUnconditional Product Guarantee for Life of the Product
IncludesOne 10 X 4.5 Inch Granular Activated Carbon Replacement Filter by Tier1
Primary Filter MediaGranular Activated Carbon

Reduced Contaminants

The TIER1-RFC20-934 reduces the following contaminants:

  • Bad Taste and Odor
  • Chlorine Taste & Odor
  • Dirt
  • Hard Scale
  • Oxidized Iron
  • Particles
  • Particles that can carry Odor
  • Rust and Corrosion
  • Sand

The TIER1-RFC20-934 is comparable with the following part numbers

Culligan RFC-BBS-D 48169 155141 1020705
10 inch Big Blue Housings 155141-27 155141-30 155141-43
155141-51 American Plumber 155141 American Plumber W10-PR American Plumber W15-PR
American Plumber WRC25HD Ametek RFC-BB Ametek RFC-BBS Bruner RFC-BBS
HD-950 Kleen Plus RFC-BBS OmniFilter BF6 OmniFilter BF7
OmniFilter T06 Pentair RFC-BBS Pentek 155141-43 Pentek RFC-BB
TO8-2-01 TO8-2-02 TO8-2-05 TO8-R-05

The TIER1-RFC20-934 fits the following model numbers



  1. Turn off water supply. Press red pressure-relief button (if present)
  2. Unscrew housing. Remove large o-ring, wipe clean and set aside
  3. Discard used filter cartridge. Wash housing with dish soap and warm water using a nonabrasive sponge or cloth. Rinse thoroughly
  4. Fill 1/3 with water. Add about 1 tablespoon of bleach and scrub to disinfect. Rinse thoroughly
  5. Lubricate o-ring with clean silicone grease. Change o-ring if any damage cuts or degradation are present. Insert o-ring in groove
  6. NOTE: This step is important to ensure a proper housing seal. Make certain the o-ring is seated level in the groove
  7. Insert new filter cartridge
  8. Screw housing onto the cap and hand-tighten. Do not over tighten. Make sure cap standpipe slips into cartridge
  9. Turn on water supply. Press pressure-relief button (if present). Check for leaks before leaving installation