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20,000 Gallon Inline KDF Filter

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20,000 Gallon Inline Water Filter with brass fittings

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The Watts Inline Filter works with all water supply using 1/4 IN lines and is perfect for residential and commercial ice makers as well as refrigerators, drinking fountains, coffee and tea brewers, motor homes and campers. This high capacity inline filter is certified for 20,000 gallons and is WQA certified for the reduction of chlorine taste and odors. The filter is easy-to-install and helps reduce scale build-up in appliances and inhibits bacterial growth. Special filtration media allows the system to be certified for bacteriostatic properties to guarantee extended filtration life.


This inline chlorine filter uses a KDF Fluid Treatment for filtration. Kinetic Degradation Fluxion (KDF) is a high-purity copper-zinc formulation that uses a basic chemical process known as redox (oxidation/reduction) to remove chemicals that give objectionable odors or tastes to water such as hydrogen sulfide (rotten eggs odor) and chlorine. KDF Process Media are generally used in place of, or in conjunction with, GAC (Granular Activated Carbon) filters, carbon blocks or inline filters. KDF Process Media helps to extend the life of GAC carbon.



  • Designed for use with refrigerators, ice-makers, RV, campers, boats, water fountains, water coolers, and commercial coffee makers
  • Compatible with all water supply using 1/4 inch lines
  • Includes one 10 IN KDF Inline Filter and two 1/4 inch brass connectors
  • Easily connects to existing plumbing
  • Reduces sediment and other particulates for better tasting drinking water
  • Recommended replacement every 6 months or 20,000 gallons
  • NSF Listed, Certified by WQA to NSF/ANSI 372 Lead Free and NSF/ANSI Standard 42


Cross Reference

  • p55-50
  • WP500318
  • p-55/50


California Prop 65 Warning CALIFORNIA PROP 65 WARNING: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.


Reduction Claims Validated for this unit by WQA (Water Quality Association):

  • NSF Listed
  • Certified to NSF/ANSI 372 Lead Free
  • The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.
  • Certified to NSF/ANSI Standard 42 for the Reduction of Aesthetic Chlorine
  • Certified by WQA
  • Independently tested by KDF, Inc




Parameter Minimum Maximum
Operating Temperatures: 32 °F (0 °C) 100 °F (38 °C)
Operating Pressure: 25 psi (172 kPa) 125 psi (862 kPa)
Filter Capacity: N/A 20,000 Gallons (75 700 litros)*
Service Flow Rate: N/A 0.5 GPM (1.9 l/min)


*Note: Filter life may vary based on local water conditions or use patterns.



  • 10 IN KDF Inline Filter
  • Two 1/4 IN brass connectors



  • Inspect at least every six months.
  • Shut off water immediately and replace if signs of leaks, weeping, cracks, breaks, wear or damage.
  • Replace filter cartridge every 20,000 gallons, when there is a noticeable drop in water flow, when water has unpleasant taste or odor, or every six months, whichever comes first.



  • Inline Cartridge (10 IN x 2.5 IN)