20 X 4.5 Granular Activated Carbon Replacement Filter by Tier1 (20 micron)

Price $40.99
Availability: In stock
TIER1-GAC-20BB replacement granular activated carbon filter by Tier1 fits all 20x4.5 inch sized water filter housings.
Choose a quantity
  • 1 Filter $40.99  
  • 3 Filters Price $39.99 each
  • 6 Filters Price $38.99 each
  • Fast same day shipping
  • Granular Activated Carbon
  • The 20x4.5 inch filter has more surface area
  • Great flow rate
See more product details
The Tier1 GAC-20BB granular activated carbon water filter reduces chlorine taste and odor in your drinking water. The Tier1 GAC-20BB is a 20 micron granular activated carbon filter. The filter measures 20-inch x 4.5-inch. This filter is great for all your water filtration needs!
Package Qty 1
Used In Brands Pentair, Pentek
Manufacturer's Id GAC-20BB
UPC 799932613890
Advertised Size (in) 20 x 4-1/2
Actual Size (in) 20 inches (length) x 4 1/2 inches (outside diameter)
Media Granular Activated Carbon
Post Filter Media Spun Polypropylene
Filter Life (gallons) 25,000
Filter Life (liters) 94635.25
Filter Life (months) 6 months
Micron Rating (Nominal) 20
Operating Temperature (°F) 40 - 125
Operating Temperature (°C) 4.4 - 51.7
Flow Rate (gpm) 4
Flow Rate (lpm) 15.14
Warranty Guarantee Unconditional Product Guarantee for Life of the Product

Reduced Contaminants

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

  • Chlorine Taste & Odor
  • Fluoride NF

The TIER1-GAC-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

Reset Instructions