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20 X 4.5 Carbon Block Replacement Filter by Tier1 (10 micron)

Price $48.99 List Price Price $69.99 Save 30%
Availability: In Stock
Fits most stand housings built for 20-inch x 4.5 inch filter cartridges
Choose a quantity
  • 1Filter$48.99 
  • 3Filters Price $46.09 each
  • 6Filters Price $44.09 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!
  • Powder Activated Carbon filter media
  • Reduces contaminants down to 10 microns
  • Provides better tasting water throughout your home
› See more product details
  • Ships fast!
  • Powder Activated Carbon filter media
  • Reduces contaminants down to 10 microns
  • Provides better tasting water throughout your home

Tier1 EPM4-20BB Filter Advantages

The Pentek EPM-20BB comparable water filter by Tier1 is a 20 x 4.5 inch whole house powder activated carbon water filter. This filter is ideal for city and suburban water applications, the EPM4-20BB by Tier1 reduces contaminants ranging from dirt and sediment to chlorine taste and odor. The powerful EPM4-20BB even reduces impurities down to 10 microns, rejecting contaminants larger than this size from making it into your drinking water. As a whole house cartridge you will receive filtered water throughout your home. Receive better quality filtered water from every faucet and order your 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!

Universal Filter Sizing

The 20 X 4.5 Tier1 EPM4-20BB carbon block replacement filter is built to fit 20-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 this size filter. The EPM4-20BB goes to work immediately providing cleaner, fresher water for up to six months or 30,000 gallons, depending on water quality and use. Enjoy cleaner better water with your whole house replacement filter today.

Package Qty1
Used In BrandsPentek, Tier1
Manufacturer's IdEPM4-20BB
Advertised Size (in)20 x 4-1/2
Actual Size (in)20-inches (length) x 4-1/2 inches (outside diameter)
Actual Size (cm)50.8 x 11.43
Outside Diameter (inches)4.5
MediaPowder Activated Carbon
Primary Filter MediaActivated Carbon Block
Materials of ConstructionGaskets made from Buna-N and Polyethylene outer netting
Filter Life (gallons)30,000
Filter Life (liters)113,562.30
Filter Life (months)6 months
Micron Rating (Nominal)10
Operating Temperature (°F)40 - 180
Operating Temperature (°C)4.4 - 82.2
Flow Rate (gpm)4
Flow Rate (lpm)15.142
Country of ManufactureChina
Warranty GuaranteeUnconditional Product Guarantee for Life of the Product
IncludesOne 20 X 4-1/2 Inch Carbon Block Replacement Filter by Tier1
Primary Filter MediaActivated Carbon Block

Reduced Contaminants

The TIER1-EPM4-20BB reduces the following contaminants:

  • Chlorine Taste & Odor
  • Dirt
  • Sand
  • Sediment

The TIER1-EPM4-20BB 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. Fill 1/3 with water. Add about 1 tablespoon of bleach and scrub to disinfect. Rinse thoroughly.
  4. Lubricate o-ring with clean silicone grease. Change o-ring if any damage cuts or degradation are present. Insert o-ring in groove.
  5. Insert new filter cartridge.
  6. Screw housing onto the cap and hand-tighten. Do not over tighten. Make sure cap standpipe slips into cartridge.
  7. Turn on water supply. Press pressure-relief button (if present). Check for leaks before leaving installation.