Large selection of replacement water filters, reverse osmosis membranes, testing kits and water filter system repair parts. From one water filter or membrane to case quantity discounts.

LOW PRICES and FAST SHIPPING SINCE 1999 !

99.5% Of All Items In Stock For Same Day Shipping!

Big Blue 20" X 4 1/2" GAC and Carbon Block Water Filters

Big Blue 20" X 4 1/2" GAC and Carbon Block Water Filters

Big Blue 20" X 4 1/2" GAC and Carbon Block Water Filters

  1. Pentek CBC-20BB # 155312 CBC20BB 20 Inch Big Blue Replacement Carbon Block Water Filter
    Pentek CBC-20BB # 155312 CBC20BB 20 Inch Big Blue Replacement Carbon Block Water Filter
    Pentek CBC-20BB # 155312 CBC20BB 20 Inch Big Blue Replacement Carbon Block Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. Big Blue Half Micron Carbon Briquette Water Filter. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 155312 CBC Series cartridges are highly effective at reducing unwanted taste, odor, chlorine, certain VOC's and pesticides from potable drinking water. With a nominal 0.5-micron rating, they are equally effective at reducing Cryptosporidium and Giardia cysts, as well as fine sediment. They also make excellent polishing filters or pre-filters in applications requiring fine filtration and high capacity. This is an excellent prefilter. Order a case and save even more. Learn More
    $99.99 Special Price $85.99 As low as $69.99
  2. Pentek EP-20BB # 155583 EP20BB Big Blue Carbon Block Replacement Water Filter Cartridge
    Pentek EP-20BB # 155583 EP20BB Big Blue Carbon Block Replacement Water Filter Cartridge
    Pentek EP-20BB # 155583 EP20BB Big Blue Carbon Block Replacement Water Filter Cartridge Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. Big Blue 5 Micron Carbon Block Water Filter. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 155583 EP Series cartridges are versatile and combine the long life of carbon block filtration with the higher dirt-loading tolerance of wound, carbon-impregnated paper cartridges like our C-1. EP Series cartridges are manufactured using a patented process that yields a cartridge with a nominal 5-micron filtration rating, high porosity and greater chlorine removal capacity. The high porosity design helps prevent the cartridge from plugging before its adsorption capability is exhausted, maximizing the utilization of the carbon while maintaining low pressure drop. Order a case and save even more. Learn More
    $63.99 Special Price $49.99 As low as $39.99
  3. Pentek EPM-20BB # 155783 EPM20BB Big Blue Carbon Block Replacement Water Filter Cartridge
    Pentek EPM-20BB # 155783 EPM20BB Big Blue Carbon Block Replacement Water Filter Cartridge
    Pentek EPM-20BB # 155783 EPM20BB Big Blue Carbon Block Replacement Water Filter Cartridge Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. Big Blue 10 Micron Carbon Block Water Filter. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 155783 EPM Series cartridges are a modified version of our "EP Series" cartridge. An economical price makes this cartridge suitable for taste, odor and chlorine reduction, as well as sediment filtration. EPM Series cartridges are manufactured using a patented process that yields a cartridge with a nominal 10 micron filtration rating, high porosity and greater chlorine removal capacity. The high porosity design helps prevent the cartridge from plugging before its adsorption capability is exhausted, maximizing the utilization of the carbon while maintaining low pressure drop. Order a case and save even more. Learn More
    $53.99 Special Price $42.99 As low as $36.99
  4. Pentek GAC-20BB # 155249 GAC20BB Big Blue GAC Carbon Replacement Water Filter Cartridge
    Pentek GAC-20BB # 155249 GAC20BB Big Blue GAC Carbon Replacement Water Filter Cartridge
    Pentek GAC-20BB # 155249 GAC20BB Big Blue GAC Carbon Replacement Water Filter Cartridge Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. Big Blue Granular Activated Carbon Water Filter. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 155249 GAC Series cartridges effectively reduce unwanted tastes, odors and chlorine from your drinking water. They are designed to allow maximum contact between the water and carbon, ensuring maximum adsorption. The construction of the cartridge allows water to enter at one end and pass through the entire length of the cartridge, while an internal expansion pad minimizes channeling or bypass. Before the water exits the cartridge, a 20 micron post filter helps remove carbon fines and other suspended particles from the filtered water. Order a case and save even more. Learn More
    $67.99 Special Price $44.99 As low as $34.99
  5. Pentek NCP-20BB # 155382 NCP20BB Big Blue GAC Carbon Taste & Odor Water Filter Cartridge
    Pentek NCP-20BB # 155382 NCP20BB Big Blue GAC Carbon Taste & Odor Water Filter Cartridge

    Pentek NCP-20BB # 155382 NCP20BB Big Blue GAC Carbon Taste & Odor Water Filter Cartridge Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands Big Blue 10 Micron Pleated Carbon Impregnated Polyester Water Filter. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 155382 NCP Series cartridges are constructed from a carbon impregnated non-cellulose media. Order a case and save even more.

    Learn More
    $49.99 Special Price $39.99 As low as $34.99
  6. Pentek RFC-20BB # 155247 RFC20BB Radial Flow Whole House GAC Carbon Big Blue Replacement Water Filter Cartridge
    Pentek RFC-20BB # 155247 RFC20BB Radial Flow Big Blue Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands
    Pentek RFC-20BB # 155247 RFC20BB Radial Flow Big Blue Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. Radial Flow 25 Micron Granular Activated Carbon Big Blue Water Filter. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 155247 Same as RFC-20BBS. RFC Series cartridges are constructed with a porous polypropylene outer shell and durable polypropylene end caps. Sandwiched between the outer shell and the core is a bed of granular activated carbon. The unique radial flow design offers the benefit of granular activated carbon filtration, such as low pressure drop, while at the same time eliminating the release of carbon fines commonly associated with GAC style cartridges. RFC Series cartridges are ideal for point-of-entry and other high flow rate applications. Order a case and save even more. Learn More
    $89.99 Special Price $74.99 As low as $65.99
  7. Pentek RFFE20-BB # 155263 RFFE-20BB Iron Reduction Big Blue Replacement Water Filter Cartridge
    Pentek RFFE20-BB # 155263 RFFE-20BB Iron Reduction Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands
    Ametek / US Filter / Plymouth / Pentek / Culligan / Kleen Plus / American Plumber / Bruner / Many Other Brands Compatible RFFE20-BB Big Blue Radial Flow Iron Reduction Water Filter. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 155263 The RFFE20-BB cartridge is designed to provide an easy and effective method of reducing iron in water, which greatly improves the taste. This cartridge helps to eliminate the orange and brown stains often found in sinks, toilets, tubs and other plumbing fixtures. It adds no harmful chemicals to the water, making it completely safe for drinking water applications. The RFFE20-BB cartridge should be installed on the main cold water line after the pressure tank or water meter. Must be used with a sediment pre-filter and radial carbon post-filter. Order a case and save even more. Learn More
    $117.99 Special Price $94.99 As low as $86.99
  8. KX CTO Plus 20BB Matrikx # 01-450-20-Matrikx
    KX CTO Plus 20BB Matrikx # 01-450-20-Matrikx

    KX_CTO-Plus 20"BB Extruded Carbon Block Water Filter Now with enhanced capacity for VOC reduction #01-450-20-Matrikx. 4¼” X 20”

    Learn More
    $59.99
  9. KX ChloraGuard 20BB Matrikx # 36-450-20-Matrikx Replacement Water Filter
    KX ChloraGuard 20BB Matrikx # 36-450-20-Matrikx Replacement Water Filter

    KX ChloraGuard 20"BB Now with enhanced Chloramine reduction #36-450-20-Matrikx  4½” X 20".  MATRIKX - CHLORAGUARD Activated Carbon Block Filter For Chloramine, Chlorine, Taste, Odor And VOC Reduction.

    Learn More
    $139.99
  10. KX CTO-20BB Matrikx # 32-450-20-Matrikx Big Blue Water Filter
    KX CTO-20BB Matrikx # 32-450-20-Matrikx Big Blue Water Filter

    KX CTO-20BB Matrikx 32-450-20-Matrikx 4¼” X 20” MATRIKX ® CTO® filters, powered by GREENBLOCK®, are made using 100% coconut shell carbon, a renewable, and ecologically sustainable material. The carbon is processed into blocks using a unique binder system and proprietary manufacturing techniques to produce filters with a greater number of micro-pores and available carbon surface area, which display superior capacity kinetic dynamics.

    Learn More
    $39.99
  11. Pentek CRFC20-BB Replacement Water Filter
    Pentek CRFC20-BB Replacement Water Filter

    20" Big Blue Radial Flow Chloramine, Chlorine, Taste & Odor Reduction Water Filter. 25 Micron Rating. #155967-43.  This Pentek CRFC20-BB carbon filter cartridge reduces chlorine and chloramine in residential and commercial drinking water. It has nominal filtration rating of 20 microns at an efficiency of 85%. The cartridge is made of granular activated carbon (GAC) media with a spun polypropylene inner wrap for post filtering of carbon fines and a porous polyethylene outer shell.

    Learn More
    $133.96
  12. Pentek BBF1-20MB Deionization Replacement Water Filter Cartridge # 155281
    Pentek BBF1-20MB Deionization Water Filter # 155281 Compatible With Ametek / US Filter / Plymouth / Culligan / Kleen Plus / American Plumber / Bruner / Many Other Brands
    Pentek BBF1-20MB Deionization Water Filter # 155281 Compatible With Ametek / US Filter / Plymouth / Culligan / Kleen Plus / American Plumber / Bruner / Many Other Brands. FDA D.I. Resin. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 155281 Order a case and save even more. Learn More
    $149.99 Special Price $119.99 As low as $99.99

Be sure to check our Parts Department for important parts such as TDS Testers For Reverse Osmosis Membranes, Replacement Tanks, O-rings , Filter Housing Wrenches, Faucets, Pumps, Fittings, UV Systems and more parts for your reverse osmosis pure water filtration system.   View maintenance and servicing tips online at our Installation & Trouble shooting Guide.