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RFC-20BB Whole House Filter Replacement Cartridge by Tier1

Price $44.99 List Price Price $64.99 Save 30%
Availability: BackOrder - Free Shipping
Fits most 20X4.5 housings
Choose a quantity
  • 1Filter$44.99 
  • 2Filters Price $43.64 each
  • 3Filters Price $42.33 each
  • Big Blue sized filter cartridge, provides greater surface area
  • High flow rate
  • Filter life of 100,000 gallons
  • Reduces contaminats such as chlorine taste and odor
See more product details
The RFC-20BB Whole House Filter Replacement Cartridge by Tier1 provides a large surface area, which increases filtration effectiveness. This greater surface area in turn allows a high flow rate. This filter will last you up to 6 months, or every 100,000 gallons which equates to 4 gallons per minute, whichever comes first. This typically evens out to only 2-3 filter changes per year. The Tier1 RFC-20BB does an exceptional job of taking out chlorine taste an odor, or your money back!

Experience the Tier1 Difference

Tier1 manufactures high-quality filtration and household products. We take creating and maintaining a healthy home seriously. Products must undergo rigorous testing and meet demanding quality expectations in order to earn the Tier1 badge. Every purchase is backed by the Tier1® Guarantee:

  • Guaranteed Fit
  • Guaranteed Quality
  • Guaranteed Price
Package Qty1
Used In BrandsPentek
Manufacturer's IdRFC-20BB
Advertised Size (in)20 x 4-1/2
Actual Size (in)20 inches (Length) x 4.5 inches (Outside Diameter)
Actual Size (cm)50.8 x 11.43
MediaRadial Flow Granular Activated Carbon
Materials of ConstructionPorous Polyethylene
Filter Life (gallons)100,000
Filter Life (liters)378541
Filter Life (months)6 months
Micron Rating (Nominal)25
Operating Temperature (°F)40 - 125
Operating Temperature (°C)4.4 - 51.7
Maximum Temperature (°F)125
Flow Rate (gpm)4
Warranty GuaranteeUnconditional Guarantee for Life of the Product
IncludesOne Tier1 20 x 4.5 inch granular activated carbon replacement filter
Primary Filter MediaGranular Activated Carbon

Reduced Contaminants

The TIER1-RFC-20BB reduces the following contaminants:

  • Chlorine Taste & Odor
  • Rust and Corrosion

The TIER1-RFC-20BB is comparable with the following part 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