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White cylindrical cartridge with textured grip and branded label

Culligan International Company

Culligan International Company D-20A Under Sink Water Filter Cartridge

SKU CH-17GF-FTVDG

Granular activated carbon cartridge replaces undersink filters US-550, US-600 and related models, reducing taste, odour and chlorine for up to 12 months or 1000 gallons

  • Reduces unpleasant tastes and odours with granular activated carbon
  • Certified by NSF International for chlorine taste and odour reduction
  • Up to 12-month or 1000-gallon cartridge life
  • Universal slim design fits Culligan US-550 and US-600 systems
  • Compatible with Culligan US-560, US-560K, CTR-210 and SY-5167 models

Universal Slim Cartridge

The Culligan D-20A cartridge fits undersink filter systems including models US-550, US-600, US-560, US-560K, CTR-210 and SY-5167. Its slim profile allows quick replacement without special tools. Granular activated carbon reduces unpleasant tastes, odours and chlorine in drinking and cooking water.

Replaces US-550 and US-600 Cartridges

This cartridge upgrades older Culligan undersink filters that use the US-550 or US-600 cartridges. The change is worthwhile when the existing cartridge reaches its rated life or when taste and odour return. It also serves compatible models such as US-560, US-560K, CTR-210 and SY-5167.

12-Month or 1000-Gallon Service Life

The filter is rated for up to 12 months or 1000 gallons, whichever comes first. Actual lifespan depends on water quality and usage volume. Households with higher consumption or heavily chlorinated supply may need replacement sooner. It is not suited for whole-house treatment or high-flow applications beyond the rated capacity.

Highlights

  • Reduces unpleasant tastes and odours with granular activated carbon
  • Certified by NSF International for chlorine taste and odour reduction
  • Up to 12-month or 1000-gallon cartridge life
  • Universal slim design fits Culligan US-550 and US-600 systems
  • Compatible with Culligan US-560, US-560K, CTR-210 and SY-5167 models

Specifications

BrandCULLIGAN INC

Questions about this item

What cartridge dimensions are required to fit the Culligan D-20A housing?

The D-20A is a universal slim cartridge measuring 2-1/2 inches by 9-3/4 inches designed to replace cartridges in Culligan US-550, US-600, US-560, US-560K, CTR-210 and SY-5167 systems.

How is the D-20A cartridge installed and what step is often missed?

Turn off the cold water supply, relieve pressure via the faucet, unscrew the housing bowl, remove the old cartridge, insert the new D-20A with the arrow pointing toward the outlet, lubricate the O-ring, hand-tighten the bowl, then slowly restore water and check for leaks.

When should the D-20A cartridge be replaced and what indicates it is due?

Replace the cartridge every 12 months or after 1000 gallons, whichever comes first; a return of chlorine taste, odor or reduced flow signals the activated carbon is exhausted and a new D-20A is needed.

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