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Big Blue Water Filters ®

Big Blue Replacement Water Filters 10" & 20" Lengths X 4 1/2" Diameter

Big Blue is a designation for filters that are 4 1/2" in diameter.  They come in two standard lengths.  10" and 20".

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  1. Regular Price: $57.99

    Special Price $44.99

    As low as: $39.99
    Pentek WP1BB20P #355222 Polypropylene 1 micron String Wound Sediment Replacement Water Filter. WP Series cartridges are manufactured from a durable polypropylene cord that is wound around a rigid polypropylene core. They are an economical solution to reduce fine sediment, including sand, silt, rust and scale particles. WP Series cartridges are wound in a precise pattern around the core providing greater surface area. The result is higher dirt-loading capacity and greater efficiency than standard wound cartridges like the CW. These string-wound cartridge styles are capable of withstanding temperatures up to 165ºF (73.9ºC), and will accommodate flow rates between 7 and 10 GPM with minimal pressure drop. WP Series cartridges are suitable for a wide variety of sediment filtration applications, including municipal and well water as well as many industrial fluids. This is a very high quality sediment filter. Learn More
  2. Regular Price: $117.99

    Special Price $94.99

    As low as: $86.99
    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
  3. Regular Price: $38.99

    Special Price $29.99

    As low as: $23.99
    Pentek DGD-5005-20 # 155358 20 Inch Big Blue 5 Micron Sediment Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. Big Blue 20" Dual Gradient 5 Micron Polypropylene Sediment Water Filter. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 155358 DGD Series is manufactured from 100% pure polypropylene fibers and are sized for use in our Big Blue® filter housings. They are designed for purity and will not impart taste, odor or color to the liquid being filtered. Also, the polypropylene construction provides superior chemical resistance and is not prone to bacterial attack. The DGD Series advanced design combines selective "final filtration" with appropriate "pre-filtration." The larger diameter of the pre-filter reduces the particle load to the post filter, allowing it to operate at higher velocities. This increased depth provides for very high particulate reduction efficiencies and loading capacities. Order a case and save even more. Learn More
  4. $39.99
    KX CTO-20BB Green 32-450-10-Green 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
  5. Regular Price: $37.99

    Special Price $29.99

    As low as: $23.99
    Pentek ECP50-20BB # 255496 ECP50-20BB Big Blue Sediment Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. Big Blue 20" 50 Micron Pleated Cellulose-Polyester Sediment Water Filter. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 255496 ECP Series cartridges are manufactured from a special formulation of resin-impregnated cellulose and polyester fibers. This construction provides high flow rates and dirt-holding capacities, while maintaining extremely low pressure drops. The media is pleated around a polypropylene core for added strength and the ends are immersed in a thermo-setting vinyl plastisol. Embedding and sealing each end of the pleat block in this fashion fuses the components together forming a unitized end cap and gasket. Order a case and save even more. Learn More
  6. Regular Price: $47.99

    Special Price $37.99

    As low as: $31.99
    Pentek R30-20BB # 155430 R-30-20BB Big Blue Pleated Sediment Replacement Water Filter Cartridge Compatible With Culligan, Ametek, US Filter, Plymouth, Kleen Plus, American Plumber, Bruner & Many Other Brands. Big Blue 20" 30 Micron Reusable Polyester Sediment Water Filter. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 155430 R Series cartridges are manufactured from a durable, non-woven and reusable polyester fabric that is suitable for a wide range of filtration uses. The media is pleated to maximize dirt holding capacity and extend the time period between changes or cleaning. R Series cartridges are resistant to both bacteria and chemical attack making them suitable for a variety of residential, commercial and industrial applications. Order a case and save even more.Learn More
  7. Regular Price: $34.99

    Special Price $26.99

    As low as: $18.99
    Pentek ECP5-20BB # 255494 Replaces #155428 CP520BB Big Blue Sediment Replacement Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. Big Blue 20" 5 Micron Pleated Cellulose-Polyester Sediment Water Filter. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 155428 CP Series cartridges are manufactured from a special formulation of resin-impregnated cellulose and polyester fibers. This construction provides high flow rates and dirt-holding capacities, while maintaining extremely low pressure drops. The media is pleated around a polypropylene core for added strength and the ends are immersed in a thermo-setting vinyl plastisol. Embedding and sealing each end of the pleat block in this fashion fuses the components together forming a unitized end cap and gasket. Order a case and save even more. Learn More
  8. $59.99
    KX_CTO-Plus 20"BB Extruded Carbon Block Water Filter Now with enhanced capacity for VOC reduction #01-450-20-Green. 4¼” X 20” Learn More
  9. Regular Price: $39.99

    Special Price $32.99

    As low as: $26.99
    Pentek ECP1-20 # 255485 ECP1-20 Sediment Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. 20" 1 Micron Pleated Cellulose-Polyester Sediment Water Filter. 20" long X 2 1/2" diameter. 14 per case, sold individually. Ametek # 255485 ECP Series cartridges are manufactured from a special formulation of resin-impregnated cellulose and polyester fibers. This construction provides high flow rates and dirt-holding capacities, while maintaining extremely low pressure drops. The media is pleated around a polypropylene core for added strength and the ends are immersed in a thermo-setting vinyl plastisol. Embedding and sealing each end of the pleat block in this fashion fuses the components together forming a unitized end cap and gasket. Order a case and save even more. Learn More
  10. Regular Price: $49.99

    Special Price $39.99

    As low as: $34.99
    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. They offer sediment filtration, as well as taste, odor and chlorine reduction all in one cartridge. Unlike cellulose cartridges, NCP Series cartridges are resistant to both bacterial attack and biofilm buildup allowing them to be used for municipal and non-chlorinated water applications. Pleats provide additional surface area for high dirt loading capacity, while maintaining minimal pressure drop. This combination of pleated polyester media and carbon filtration produces and outstanding filter cartridge with extended service life. NCP Series Big Blue water filter cartridges are excellent polishing filters, and are ideal for whole house and well water applications. Order a case and save even more. Learn More
  11. Regular Price: $47.99

    Special Price $37.99

    As low as: $32.99
    Pentek C-1 # 155002 Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner /OMNIFILTER And Many Other Brands C1 Taste & Odor Water Filter. Activated Carbon-Impregnated Cellulose 5 Micron Taste & Odor Water Filter. 9 3/4" long X 2 1/2" diameter. 24 per case, sold individually. Ametek # 155002 C Series cartridges offer an economical solution for all your general-purpose water filtration needs. Constructed of a carbon impregnated cellulose media, these dual-purpose cartridges filter out fine sediment particles and reduce unwanted taste, odor and chlorine from your tap water. A polyester reinforcement backing and external netting provide additional strength and dirt-loading capacity. These dual-purpose cartridges are well suited for a wide range of residential applications, and make excellent polishing filters when used in process or closed-loop streams. Order a case and save even more. Learn More
  12. $29.99
    Pentek 255495-43 ECP20-20BB 20 Micron 20" Pleated Cellulose Big Blue Water Filter Learn More
  13. Regular Price: $49.99

    Special Price $39.99

    As low as: $35.99
    AquaPure AP810-2 by 3M Purification ® #55779-07 aka Aqua-Pure or Aqua Pure - Large Diameter 5 Micron 20 Inch Long Sediment Filter. For Premium Performance Filtration. This AquaPure larger diameter dirt & rust cartridge is for larger homes and commercial applications. It is made from an exclusive process using pure white celluose fibers. As water passes from the outer surfaces into the center of the cartridge, the filtering pores become increasingly smaller to remove even microscopic particles. Unlike string-wound and pleated paper cartridges, the rigid, sturdy construction of the Aqua-Pure cartridges are able to withstand high pressure drop and stressful conditions such as water hammer. While it fits AquaPure Filter Housing AP802, it also fits other major brands. Learn More
  14. Regular Price: $53.99

    Special Price $42.99

    As low as: $36.99
    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
  15. Regular Price: $52.99

    Special Price $39.99

    As low as: $34.99
    Pentek WP25BB20P #355225 Polypropylene 25 micron String Wound Sediment Water Filter. WP Series cartridges are manufactured from a durable polypropylene cord that is wound around a rigid polypropylene core. They are an economical solution to reduce fine sediment, including sand, silt, rust and scale particles. WP Series cartridges are wound in a precise pattern around the core providing greater surface area. The result is higher dirt-loading capacity and greater efficiency than standard wound cartridges like the CW. These string-wound cartridge styles are capable of withstanding temperatures up to 165ºF (73.9ºC), and will accommodate flow rates between 7 and 10 GPM with minimal pressure drop. WP Series cartridges are suitable for a wide variety of sediment filtration applications, including municipal and well water as well as many industrial fluids. This is a very high quality sediment filter. Learn More
  16. Regular Price: $27.99

    Special Price $19.99

    As low as: $16.99
    Pentek S1-20BB # 155305 S1-20BB Big Blue Sediment Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. S1-20BB Big Blue 20" Pleated Cellulose Sediment Water Filter. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 155305 S1 series cartridges are economically priced and highly effective at reducing sediment particles down to 20 micron in size. Whole house or point of entry filtration to filter out sand, silt, dirt and rust particles that can restrict and plug finer filters, screens or equipment. Order a case and save even more. Learn More
  17. Regular Price: $38.99

    Special Price $29.99

    As low as: $23.99
    Pentek DGD-7525-20 # 155356 20 Inch Big Blue 25 Micron Sediment Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. 20 Big Blue 20" 25 Micron Dual Gradient Polypropylene Sediment Water Filter. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek #155356 DGD Series is manufactured from 100% pure polypropylene fibers and are sized for use in our Big Blue® filter housings. They are designed for purity and will not impart taste, odor or color to the liquid being filtered. Also, the polypropylene construction provides superior chemical resistance and is not prone to bacterial attack. The DGD Series advanced design combines selective "final filtration" with appropriate "pre-filtration." The larger diameter of the pre-filter reduces the particle load to the post filter, allowing it to operate at higher velocities. This increased depth provides for very high particulate reduction efficiencies and loading capacities. Order a case and save even more. Learn More
  18. Regular Price: $119.99

    Special Price $99.99

    As low as: $87.99
    Pentek 20" Big Blue OAC-20BB #155596 Oil Absorbing Repalcement Filter Cartridge Learn More
  19. Regular Price: $89.99

    Special Price $74.99

    As low as: $65.99
    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
  20. Regular Price: $38.99

    Special Price $29.99

    As low as: $24.99
    Pentek DGD-2501-20 # 155360 20 Inch Big Blue 1 Micron Sediment Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. Big Blue 20" Dual Gradient 1 Micron Polypropylene Sediment Water Filter. 20" long X 4 1/2" diameter. 6 per case, sold individually. Ametek # 155360 DGD Series is manufactured from 100% pure polypropylene fibers and are sized for use in our Big Blue® filter housings. They are designed for purity and will not impart taste, odor or color to the liquid being filtered. Also, the polypropylene construction provides superior chemical resistance and is not prone to bacterial attack. The DGD Series advanced design combines selective "final filtration" with appropriate "pre-filtration." The larger diameter of the pre-filter reduces the particle load to the post filter, allowing it to operate at higher velocities. This increased depth provides for very high particulate reduction efficiencies and loading capacities. Order a case and save even more. Learn More
  21. $139.99
    KX ChloraGuard 20"BB Now with enhanced Chloramine reduction #36-450-20-Green 4½” X 20" Learn More
  22. Regular Price: $19.99

    Special Price $15.99

    As low as: $11.99
    Pentek ECP20-BB # 255491 ECP20BB Big Blue Sediment Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. Big Blue 20 Micron Pleated Cellulose-Polyester Sediment Water Filter. 10" long X 4 1/2" diameter. 8 per case, sold individually. Ametek # 255491 Culligan CP-5BBS use as ECP5-BB (255490) ECP Series cartridges are manufactured from a special formulation of resin-impregnated cellulose and polyester fibers. This construction provides high flow rates and dirt-holding capacities, while maintaining extremely low pressure drops. The media is pleated around a polypropylene core for added strength and the ends are immersed in a thermo-setting vinyl plastisol. Embedding and sealing each end of the pleat block in this fashion fuses the components together forming a unitized end cap and gasket. Order a case and save even more. Learn More
  23. Regular Price: $63.99

    Special Price $49.99

    As low as: $42.99
    Pentek PCF1-20MB # 155274 PCF1 20MB Deionization Water Filter Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands Deionization Water Filter. FDA D.I. Resin. 20" long X 2 7/8" diameter. 6 per case, sold individually. Ametek # 155274 PCF Series cartridges have been developed in response to the requirements for deionized water in many industries. They are manufactured using an FDA-compliant resin that has been subjected to additional post-production steps to minimize the total organic carbon (TOC) level. This high capacity, semi-conductor-grade resin cartridges are ideal for use in pharmaceutical and medical laboratories, cosmetics and circuit board printing applications. Order a case and save even more. Learn More
  24. Regular Price: $99.99

    Special Price $85.99

    As low as: $69.99
    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
  25. $19.99
    Pentek PP30-BB #155120 Replacement Water Filter Cartridge Learn More
  26. Regular Price: $97.70

    Special Price $49.50

    As low as: $46.50
    AquaPure AP811-2 by 3M Purification ® #55779-09 aka Aqua-Pure or Aqua Pure - Large Diameter 25 Micron 20 Inch Sediment Filter. For Premium Performance Filtration - This Aqua-Pure larger diameter dirt & rust cartridge is for larger homes and commercial applications. It is made from an exclusive process using pure white celluose fibers. As water passes from the outer surfaces into the center of the cartridge, the filtering pores become increasingly smaller to remove even microscopic particles. Unlike string-wound and pleated paper cartridges, the rigid, sturdy construction of the Aqua-Pure cartridges are able to withstand high pressure drop and stressful conditions such as water hammer. While it fits Aqua-Pure Filter Housing AP802, it also fits other major brands. Cartridge Dimensions: 19 7/8" High x 4 5/8" Diameter - Graded Density For Long Life Hot & Cold Water (up to 100° F) Flow Rates up to 45 GPM - 25 Micron Nominal Medium Sediment Removal. Sold Individually. Learn More
  27. Regular Price: $67.99

    Special Price $44.99

    As low as: $34.99
    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
  28. Regular Price: $54.99

    Special Price $41.99

    As low as: $36.99
    Pentek WP5BB20P #355223 Polypropylene 5 micron String Wound Sediment Water Filter. WP Series cartridges are manufactured from a durable polypropylene cord that is wound around a rigid polypropylene core. They are an economical solution to reduce fine sediment, including sand, silt, rust and scale particles. WP Series cartridges are wound in a precise pattern around the core providing greater surface area. The result is higher dirt-loading capacity and greater efficiency than standard wound cartridges like the CW. These string-wound cartridge styles are capable of withstanding temperatures up to 165ºF (73.9ºC), and will accommodate flow rates between 7 and 10 GPM with minimal pressure drop. WP Series cartridges are suitable for a wide variety of sediment filtration applications, including municipal and well water as well as many industrial fluids. This is a very high quality sediment filter.Learn More
  29. Regular Price: $64.99

    Special Price $52.99

    As low as: $45.99
    Pentek WS-20BB #155321 WS20BB Water Softening Filter Cartridge Compatible With Culligan / Ametek / US Filter / Plymouth / Kleen Plus / American Plumber / Bruner & Many Other Brands. Water Softening Filter Cartridge #155321 20" Big Blue. Learn More
  30. Regular Price: $63.99

    Special Price $49.99

    As low as: $39.99
    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
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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.