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 42 reviews
90%
(38)
5%
(2)
2%
(1)
0%
(0)
2%
(1)
A
A. Duffy
No Complaints Here

Not much to report other than no complaints here! Being able to see when to change the filter is a real bonus, as changing it out definitely isn't forgotten. Happy I found this product!

A
A. Duffy
This Pair Packs A Punch

I love the ease of ordering these replacement cartridges. On top of smooth shipping, the cartridges themselves are easy to replace and provide lasting filtration. Five stars all around!

T
Tamala Edmonds
Love this Product!

My daughter lives in Florida where the sediment is very high in her water. She started using these filters and her acne cleared up. She needs to replace her filter every two - three months but it is worth the softer skin and acne clearing. It looks like black goo in the filter. We live in PA and we change ours every six months. It is not the products fault if you live in a high sediment area. We love the product and they have amazing customer service. The 3 set is for high sediment areas too.

Thank you so much, Tamala! We're thrilled to hear that both you and your daughter are seeing such great results with the Weddell Duo — especially the clearer skin and softer feel. You're absolutely right: areas like Florida often require more frequent filter changes, and we’re glad the 3+1 set is working well for your daughter's needs. We also truly appreciate your thoughtful note about high sediment not being the product's fault — that means a lot. Thank you for being part of the Weddell Water community!

j
jane678

Works well & easy to use

Thank you so much, Jane! We're so glad to hear the replacement cartridges are working well and that you found them easy to use. If you ever have any questions or need support, we're always here to help.

T
T G
Best Water Filter I Can Find

We love the Weddell system so much. We have very hard and chlorinated water which this system helped with instantly. Hair and skin softer in a day. I did not think it was possible.

And...love that you can see the filter. While we saw what it was doing right away...we learned to wait for the water pressure to go down a bit too before replacing the filters. Which is also why we like this system so much....they did not try to upsell us right away. Told us to wait a little longer.

Thank you so much for your kind words! We're thrilled to hear that the Weddell Duo has made such a noticeable difference in your water quality — and so quickly, too. It's especially rewarding to know that your hair and skin are feeling softer and healthier. We’re also glad the clear housing and pressure-based replacement timing have been helpful — we designed it that way to keep things honest, transparent, and customer-first. Your thoughtful feedback means the world to our team. Thank you for being part of the Weddell Water community!