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D-20A Culligan Level 1 Undersink Water Filter Replacement Cartridge

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D-20A Culligan Level 1 Undersink Filter Replacement Cartridge

Quick Overview

Fits Culligan US-550, US-600, US-600A, RO-2127, RO-3000, RO-3500, and any brand of water filtration system that uses standard 9 3/4 x 2 1/2 filter cartridges

Availability: In stockShips Tomorrow, Aug 31st



Undersink replacement water filter for water filtration systems that use 9 3/4 inch x 2 1/2 inch cartridges. Fits Culligan US-550, US-600 and more.
  • Lasts four times longer than the Culligan D-10
  • Recommended for city and well water supplies
  • Granular activated carbon filter media
  • Genuine OEM Product


Package Qty 1
Used In Brands Culligan
Manufacturer's Id D-20A
UPC 033663005105
Advertised Size (in) 10 x 2-1/2
Actual Size (in) 9 3/4 inches (length) x 2 1/2 inches (outside diameter)
Actual Size (cm) 24.77 x 6.35
Media Granular Activated Carbon
Primary Filter Media Granular Activated Carbon
Filter Life (gallons) 1,000
Filter Life (liters) 3,785.41
Filter Life (months) 12 months


Reduces the following contaminants:
  • The CULLIGAN-D-20 does not reduce fluoride.


The CULLIGAN-D-20 is comparable with the following part numbers


Replacement for the Following UPC


7 Item(s)

per page
Cheap filter cheap results Review by Wet Willie
I'm on a well and the D-20 doesn't deal with a sulfur odor very well. It's supposedly a 12 month filter and the sulfur odor comes back within a month or two. (Posted on 12/27/09)
Fits my Ace #45335 under sink filter Review by ddriskell
I was happy to find a cartridge to fit my Ace under sink filter because Ace told me their cartridges have been discontinued. Our water is pretty good but the filter takes out any pipe sediment and some of the chlorine too. I use it to filter drinking and cooking water. The water from the filter tast (Posted on 6/28/12)
Best Filters Ever. Review by Walter
Just follow the easy instructions. I love this product. I save a lot of money not buying bottled water which I find little difference. (Posted on 6/28/12)
filters Review by ron
overall system works great but charcoal after filter makes water taste nasty although good for coffee. (Posted on 6/29/12)
Works perfectly- was shipped promptly Review by Ken
Living in a rural area with hard well water with lots of iron and other minerals in it. Have had this system in place nearly ten years. Was time to change the filters (Posted on 4/1/13)
Great place to do business with. Review by TnLady2014
Fit great. (Posted on 5/5/14)
works as described Review by Vid
good price, good product (Posted on 12/12/14)

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