US Water Big Blue Dual Filtration System 4.5 X 20 | BBF2-20

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Regular Price $383.26 As low as $229.95
This 2-Stage filtration system is designed to filter the water supply for a whole house or other pre-filtration application for business or industry

US Water Two-Stage 4.5" x 20" Water Filtration System

  • 3/4" or 1" Full Flow Inlet & Outlet
  • Includes mounting bracket, screws, and filter wrench.
  • Flows up to 25 GPM, depending upon filters utilized.

20" Commercial-Grade Cartridge Filter Housing With 3/4" or 1" Inlet/Outlet - Includes Pressure Relief Valve

This is a commercial-grade high-quality, rugged filter housing built to withstand severe conditions. It's exclusive thread design provides superior sealing and greater security against leaks. The replacement filters are compatable with any 4.5" x 20" filter cartridge on the market. It uses the same cartridges as Ametek, American Plumber, Culligan, Flowmatic, Liquatec, Pentek and Watts, as well as most other brands of housings.

Filter Options

  • 20 & 5 Micron Pleated filters for removing moderate amounts of dirt and sediment (typically used for well water)
  • 5 & 1 Micron Pleated filters for removing finer dirt and sediment (typically used for city or well water)
  • 5 micron & Radial Carbon filters for removing dirt, sediment, and chlorine (typically used for city water)
  • 5 micron Pleated & Carbon Block for removing dirt, sediment, and chlorine (typically used for reverse osmosis pre-treatment)


  • Manufactured from the highest quality, FDA grade, 100% NSF listed polypropylene
  • Leak-proof sealing is accomplished by compression against a top seated EPDM o-ring located in the housing’s sump
  • Thick wall and added ribs make the housings ideal for a wide range of applications
  • Buttress Thread Design Provides Superior Sealing & Greater Security
  • Polypropylene construction provides excellent chemical resistance with most acids, alcohol, ammonia, oils, plating solutions and many aggressive chemicals
  • Housings supplied with pressure release valves
  • Rated for temperatures to 100°F and pressures to 90 psi
  • Utilizes 20 in.Big Blue Commercial Housing with Pressure Relief Valve
  • 3/4" or 1" Inlet & Outlet

NOTE:If you are unsure what type of filter would be best for your application, contact one of our Certified Water Specialists at 800-608-USWA or e-mail us at Our experts are available 7 days a week from 8 AM until 11 PM EDT.

additional information

Filter Size4.5 x 20
ManufacturerUS Water Systems