Filter Comparison

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Full Set

1+1

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Twin Set

2+2

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Full Set + Extra Filters

3+1

Replacements

1 Replacement

2 Replacements

3 Replacements

Best For

A single, straightforward replacement

Two, cost-effective replacements

More sediment-heavy water or those who want extra longevity

What's Included

1 Filter Cartridge #1 (White) and 1 Filter Cartridge #2 (Black)

2 Filter Cartridge #1 (White) and 2 Filter Cartridge #2 (Black)

3 Filter Cartridge #1 (White) and 1 Filter Cartridge #2 (Black)

How to Replace

Replace both filters once

Replace both filters twice

After replacing both filters once, replace just the white filters 2 more times—for a total of 3 replacements

Cost per Replacement

$29.99

$24.99

$19.99

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Full Set

1+1

Replacements

1 Replacement

Best For

A single, straightforward replacement

What's Included

1 Filter Cartridge #1 (White) and 1 Filter Cartridge #2 (Black)

How to Replace

Replace both filters once

Cost per Replacement

$29.99

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Twin Set

2+2

Replacements

2 Replacements

Best For

Two, cost-effective replacements

What's Included

2 Filter Cartridge #1 (White) and 2 Filter Cartridge #2 (Black)

How to Replace

Replace both filters twice

Cost per Replacement

$24.99

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Full Set + Extra Filters

3+1

Replacements

3 Replacements

Best For

More sediment-heavy water or those who want extra longevity

What's Included

3 Filter Cartridge #1 (White) and 1 Filter Cartridge #2 (Black)

How to Replace

After replacing both filters once, replace just the white filters 2 more times—for a total of 3 replacements

Cost per Replacement

$19.99

From the Experts

"The Weddell Duo shower filter got the highest contaminant reduction score of all the shower filters we tested. It also scored well for its filtration rate, design quality, and setup and maintenance requirements, awarding it the highest overall score and making it the shower best filter we tested."

"The Weddell Duo is the best shower filter overall, and the only one tested and verified to remove PFAS, microplastics, and chlorine. It’s the shower filter that removes the most contaminants. What a relief! I use it in my own bathroom."

"Weddell Duo is the only shower filter on the market to be NSF certified and verified to reduce PFAS. It not only meets rigorous industry standards but also addresses real concerns about harmful contaminants that can affect your health."

"When it comes to shower filters, I didn’t really think there was much difference from one shower filter to the next. But when I started using the Weddell Duo I quickly found out I was wrong.“

Replacement Cartridges FAQs

How often do I need to replace the filter cartridges?

You should change your filters if any of the following occurs: 1) 5-6 months has passed, 2) you notice decreased water pressure and/or filter discoloration, or 3) when the rated capacity of the filter cartridge has been reached.

The frequency of replacement depends on your water usage and the quality of your water supply. Regular replacement ensures that your shower water remains clean and safe.

How do I replace the filters?

Replacing the filters is easy! The Weddell Duo's clear dual-cartridge system allows you to monitor their condition. Simply remove the filter cartridges chambers by gently turning them counter clockwise twist and replace. No tools are required.

For additional help, please watch our replacement guide video here.

Why are my filters slowing down before the suggested lifespan?

Factors like hard or highly contaminated tap water, heavy sediment, or frequent use can cause your filters to slow down sooner than expected. This is because the filters are capturing more material than typical municipal water, and as it works harder to remove contaminants, the available space for water to pass through becomes filled. While the water flow may slow, this doesn’t mean the filters are defective—it means it’s doing its job effectively. The more contaminants and materials it captures, the sooner it will need to be replaced.

Do the filters remove the same contaminants regardless of which set I buy?

Yes, all our replacement filters are designed to provide the same high level of filtration, removing chlorine, PFAS, and particulates while maintaining excellent water flow.

What’s the difference between the three types of replacement filters?

  • Full Set: Includes just one full set of filters (1 black and 1 white) for a single replacement.
  • Twin Pack Replacement Cartridges: Includes two full sets of filters (2 black and 2 white), providing two full replacements.
  • Full Set + Extra Filters: Includes one full set of filters (1 black and 1 white) plus two extra white sediment filters, offering three replacements in total.

Customer Reviews

Based on 26 reviews
85%
(22)
8%
(2)
4%
(1)
0%
(0)
4%
(1)
J
Juan Lopez
Never leave home without it

Love this filter. My hair and skin feel softer than ever before!

D
Deborah
Absolutely AMAZING!

After researching several filters I decided on this company and cannot say enough good things about them. Customer service, shipping, ease of installation and the products themselves are all stellar! You can see below in my photo how wonderful the filters work. Thank you so much!

Thank you, Deborah! We're so happy to hear that your experience with Weddell has been a great one from start to finish. It means the world to us that you took the time to research and chose us — and we're thrilled that the filters (and our team!) have exceeded your expectations. Thanks for being part of the Weddell Water community and for sharing your photo and kind words!

H
Hiroko
The ultimate apartment shower setup

My whole body got itchy as hell after I moved to this apartment and I was pretty desperate. I felt a lot better after just one shower with the Weddell Duo, but I was still a bit itchy. I used test strips to test the water and the Duo didn't seem to do great at filtering chlorine and bromine (and of course the Duo doesn't address hardness). So I added Softwatercare's softener and carbon filter, which did the trick. My skin feels great now. Thanks, Weddell!

Thank you so much, Hiroko! We're so glad to hear the Weddell Duo brought you quick relief and became a core part of your apartment shower setup. You’re absolutely right—while the Duo doesn’t address water hardness, it is NSF certified to reduce free available chlorine, which is the form most commonly found in municipal water. If your local supply uses chloramine instead of chlorine, some test strips may not register a big difference, since they're designed to detect free chlorine, not chloramine. Every water setup is different, and we love that you found the right combination to get your skin feeling great again. Thank you for sharing your experience!

I
I.P.
Something that will divide your life into before and after

Your skin and hair become soft and pleasant, your hands no longer dry out and you don't need to constantly use hand cream, your skin copes with everything itself.
After normal water, it's hard for me to use water in hotels or restaurants, because my skin immediately feels the difference.

Thank you so much for this incredible review! We're thrilled to hear that the Weddell Duo has made such a powerful difference in your skin and hair health. It's amazing how much of an impact clean, filtered water can have—and we’re honored to be part of your “after.” Thank you for trusting us as step zero of your self-care routine!

L
L.
Very Pleased!

I've been using the water filter for an about 2 months now, and I have noticed a huge difference with the chlorine filtration. I have noticed a difference in my skin and hair and highly recommend this product.