Search  for anything...

Culligan D40 Level-4 Drinking Water Replacement Cartridge

Based on 461 reviews
Condition: New
Checking for the best price...
$28.95
Save $16.04 was $44.99

Buy Now, Pay Later


As low as $7 / mo
  • – 4-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: 12 left in stock
Fulfilled by Amazon

Arrives Friday, Nov 6
Order within 7 hours and 19 minutes

Available payment plans shown during checkout

Protect Your Purchase

Easy claims online, fast replacements, no fees

Checking for protection plans...

At a glance

Condition
New
Model
D-40A
Dimensions
2.5"D x 2.5"W x 9.75"H
Weight
6.72 oz
Material
Carbon Block, Polypropylene (PP)
Set Name
Superior
In the box
1 water filter cartridge

Features 5

  • SUPERIOR FILTRATION: Reduces lead, mercury, asbestos, atrazine, lindane, cloudiness, sediment, chloramine, and chlorine taste and odor at 0.5 microns.
  • THE UPGRADE PATH: Culligan's most complete under-sink cartridge everything the D-20A does, plus heavy metals and organic contaminants.
  • FITS CULLIGAN UNDER-SINK SYSTEMS: Drops into US-600A, US-550, US-560, and CTR-210. Tool-free, no plumber required.
  • CARBON BLOCK MEDIA: Denser than granular carbon, capturing finer particles and dissolved contaminants granular media passes through.

Description

The Culligan D-40A superior under-sink water filter replacement cartridge delivers clean, fresh-tasting water straight from your existing kitchen faucet. Designed for easy installation on a 3/8-inch cold water line, it fits Culligan US-600A, US-550, US-560, and CTR-210 under-sink filtration systems. This activated carbon block cartridge reduces lead, mercury, asbestos, atrazine and lindane, cloudiness, sediment, particulate Class I, chloramine, and chlorine taste and odor at 0.5 microns — everything the D-20A does, plus heavy metals and organic contaminants. With a 6-month or 600-gallon lifespan, the D-40A is the most complete cartridge available for Culligan standard under-sink systems. From the Manufacturer The Culligan D-40-D Level 4 Carbon Block Water Filter. It will reduce chlorine taste, odor, and sediment. The filter comes with a 0.5-micron (nominal) filtration and has a filter life of 6 months or 600 gallons.

Specs 21

Material Carbon Block, Polypropylene (PP)
Product Dimensions 2.5"D x 2.5"W x 9.75"H
Item Weight 6.72 ounces
External Testing Certification IAPMO
Product Benefits Reduces contaminants, bad taste & odor, and lead for clean, fresh drinking and cooking water
Model Number D-40A
Brand Name Culligan
Number of Packs 1

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Nov 6

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


Works great!
Model: D40A Style: Premium Filtration
This filters so well!
Reviewed in the United States on December 20, 2023 by Volforlife

Great tasting water from a secondary tap in our kitchen
Model: D40A Style: Premium Filtration
Our city water has a lot of softeners added and is not too tasty when consumed straight from the tap (especially if it sits a little while). I added a secondary drinking water faucet to our kitchen sink with the water passing through an under-counter standard size filter housing. We've tried lots of different brands and types of water filters, most considerably less expensive than this Culligan D-40a cartridge. Most don't completely remove the bad taste from the water, and those that do tend to lose that ability within a month or two. These Culligan D-40a filters do an outstanding job with the water tasting great. They continue to do a wonderful job over many months. What we find is that, with time, the flow rate through the filter slows down, even though the water still tastes great. After about 6 months, it becomes tedious waiting for a water pitcher to fill. That's when I know it's time for a replacement. These filters also have the added advantage of being a Level-4 filter - reducing lead, mercury, and a host of other noxious substances as well as microbial cysts. It gives us peace-of-mind to know these potential hazards are being dealt with. Bottom line: I think these filters are worth the extra money given the great tasting water they produce as well as the wide range of hazardous substances they handle. ... show more
Reviewed in the United States on December 5, 2022 by Daddio Dave Daddio Dave

Good filter, but.... .
Model: D40A Style: Premium Filtration
While the water quality greatly improved, and all chlorine smell had dissappeared, the flow had been reduced. Something that is expected from 0.5u system.
Reviewed in the United States on May 19, 2024 by abdimona

"Certifications" of a number of brands seem suspect
Model: D40A Style: Premium Filtration
I did some investigating and "certifications" of a couple of brands weren't widely accepted. My review of that brand was rejected by Amazon. As this one may be for mentioning that. Culligan is well known, has long been well certified by real-deal labs, for decades.
Reviewed in the United States on August 15, 2023 by YB

OOPS...don't install upside down or there will be a trickle of water...
Model: D40A Style: Premium Filtration
We have used the Culligan D40 cartridge for many years. Living in Los Angeles our water is not the best so filtration is necessary. We have not had any slow flow issues like others have commented until this last purchase. My husband replaced the cartridge like he always does, but this time the flow was down to a trickle. For a week we waited and waited to fill a glass of water from the fridge water/ice dispenser and I was so frustrated. I finally told my hubby to remove the cartridge and I was going to send it back as defective. This has never been the case with previous D40 cartridges we have replaced. They always work fine, have a normal flow and the water tastes great. As my hubby removed the cartridge he looked at the hole at the top and said, " this is way smaller than the other one", then he flipped it over and found he had installed it upside down. He put it back in the correct way and "viola", it worked perfect. Water flow was back to normal, the water was totally clear and free of any taste, and no more issues with the cartridge. So, just an FYI, make sure you are checking to make sure it is installed correctly and not upside down. ... show more
Reviewed in the United States on February 20, 2015 by M&M&M

Helpful
Model: D40A Style: Premium Filtration
Clean water is such a joy. Knowing my dring water is safe is a peace of mind.
Reviewed in the United States on July 5, 2023 by Darlene B.

A good product and great value for the money
Model: D40A Style: Premium Filtration
I spoke to Culligan customer service technician and the man suggested using an awl (I used a drill) to slightly widen the hole at the top of the filter to increase water flow. It's lowered because of all the stuff it has to pass through. On the cheaper culligan filters (D10 and D20) the flow is much greater, but the filtration is that much less. I don't trust municipal water any more, so I filter my drinking & cooking water with this system and have been pleased with it and with Culligan customer service. ... show more
Reviewed in the United States on February 14, 2018 by Cool Kelly

Cuts flow rate
Model: D40A Style: Premium Filtration
New faucets seem to have the flow rate of California's over-regulated requirements. This filter works well but cuts the flow rate even more. If you don't need the extra filtering, select the D20.
Reviewed in the United States on March 25, 2023 by CPlogic
Checking for best price...