Tech
I’ve Spent a Year Testing Shower Filters. The Winners Were Clear
Compare Our Top Shower Filter Systems
Honorable Mention Shower Filters
Photograph: Matthew Korfhage
HigherDose Red Light Shower Filter for $599: This shower filter is in some ways the most intriguing shower filter idea I’ve encountered in the past year—a shower filter that also incorporates a ring of lights delivering dual red and near-infrared wavelengths (650 nm and 850nm) at purported therapeutic intensity. Aside from turning your shower into a discotheque, this amounts to a time-saving measure for those who would otherwise avail themselves of red light therapy on mats or with scary-looking masks. In this case, the red light therapy happens while you shower. The 10-stage filter, in my at-home testing, was able to remove 90 percent of the total chlorine from my chloramine-treated water. We’re still testing and looking into both the filter and the red light therapy over longer-term testing, but the device is already well worth mention.
Photograph: Matthew Korfhage
Afina A-01 Filtered Showerhead for $129: Afina’s two-stage chlorine filter is as effective as any of the filtered showerheads we tested out of the box, reducing total chlorine levels to undetectable amounts when it’s new. The broad, spa-like spray was also among the most pleasant of any showerhead we tested. But no independent lab testing was offered, and filter replacement is a bit more expensive than some, at $29 every two months with a subscription (or $40 every two months without).
Filterbaby Diamond Series Shower Filter for $113: This inline filter was able to reduce total chlorine levels to undetectable amounts, one of few filters on the market able to do so—and the fact that it’s an inline filter means you’ll be able to keep your existing showerhead and just slot this filter in between the pipe and your showerhead. That said, it’s a bulky filter, which means your showerhead will be about 4 inches lower than it used to be, and the screw-in system is a little awkward: It’s one of the only showerheads I actually needed a wrench to install properly. The replacement filters are designed to use minimal plastic, but they are also more expensive than most, at $42 every three months.
Photograph: Matthew Korfhage
Sproos! Filtered Hand Shower for $148 ($120 with subscription): Sproos is a quirky, kicky, kooky shower brand aimed squarely at young “renters and DIYers”—offering a rainbow of bold colors for handheld filtered showerheads. Sproos has made some improvements to its design since WIRED first tested in 2024. Its shower filters are also recyclable, a rare distinction. The filters removed most, but still not all total chlorine out of the box upon our testing in early 2026, in a chloramine-treated water system. And like a lot of shower filters, no independent lab testing has been released publicly.
Hydroviv Filtered Shower Head for $160: Hydroviv is a water filter company of long standing, and its KDF-55, calcium sulfite, and catalyzed carbon showerhead ranks among the few shower filters I’ve tested that was able to filter total chlorine levels down to undetectable levels in a chloramine-treated water system. Hydroviv suggests filter replacements once every six months, a longer span than comparable shower filters such as Canopy or Afina; that said, its $75 filters cost double or more what other filters do, and I noted significant loss of efficacy after four months. As with most makers of shower filters, requests to see independent lab testing results were unsuccessful. Hydroviv claims its filter media help reduce bacterial growth, though the materials cited are the same listed in other shower filters.
ShowerClear Filtered Shower Head, pictured as installed at a WIRED reviewer’s home.Photograph: Matthew Korfhage
ShowerClear Showerhead for $139: OK, you got me. This isn’t a filter. The ShowerClear is instead designed to solve a problem you probably hadn’t thought about but now may keep you up at night: Potentially infectious bacteria called mycobacteria, prone to causing lung infections, enjoy growing inside showerheads and are resistant to chlorine-treated water. They grow in colonies, a bit like fungus. Hence, the name. What’s worse, if you can’t open up your showerhead, you can’t see them and you don’t know they’re there. Gives you the willies. Anyway, this ShowerClear has a hinge and a latch. This means you can open it up, look inside, and clean its interior completely, with soap or vinegar or disinfectants. This is a very rare quality even among filtered showerheads. I’d be happier if the ShowerClear’s water flow fanned out a little better, or if the latch were less of a defining design feature. But what’s all that for a little peace of mind? (That said, if you want a filter to remove chlorine, you’ll also need an inline filter like the Weddell Duo.)
Photograph: Matthew Korfhage
Croix Filtered Showerhead for $129 and Croix Handheld Showerhead for $129: Shower filter company Croix was founded by chemical engineer Spencer Robertson, an old hand at water filtration. The fixed showerhead is handsome, and the handheld shower has a much broader array of spray settings than most—including a fun, ultra-broad spray setting that’s like a savagely powerful misting device. This said, the KDF-55 and calcium sulfite filter didn’t filter even close to the majority of total chlorine levels from my chloramine-treated water system. Based on results I’ve reviewed from Croix’s internal testing, I’d more likely recommend this device for chlorine-treated systems like the one in New York City. WIRED was able to review internal testing showing that Croix’s filters were successful at filtering most free chlorine from water, in accordance with NSF standards. Replacement cartridges and filters are reasonably priced and recommended once every four months, a longer interval than most brands on the market.
Photograph: Matthew Korfhage
Aquasana Inline Filter for $150: Aquasana’s funnily bulbous two-layer filter removed the majority of total chlorine in my chloramine-treated system, and it was also one of the only shower filter companies to offer independent testing data backing up its claims for chlorine-based systems. So far, so good. So why’s it not up near the top of our list? A flimsy shower wand with poor spray force and radius, a slight but unfortunate tendency toward leakiness at the shower connection, and unforgiving geometry that means it doesn’t link up well with all showerheads as an inline filter. Still, it works and it’s lab-attested for free chlorine removal, and I happily recommend it.
Photograph: Matthew Korfhage
Jolie Filtered Showerhead for $169: The Jolie showerhead pioneered the influencer-centric, testimonial-driven marketing model that has made shower filters so dominant in the public conversation. Its design, which looks a bit like a giant Monopoly playing piece and comes in chrome, gold, black, or red, is eminently likable. The device offers even water spray and a soft, stippled faceplate that feels luxuriant in the strangest of ways. But Jolie didn’t respond to requests for independent testing when we asked in 2024, and our own testing put it somewhere in the middle of the pack in terms of removing total chlorine from a chloramine-treated system.
Also Tested
Kohler Cinq for $150: Kohler is a venerable Wisconsin brand with a number of water treatment options for showers and faucets. The Cinq filtered showerhead is admirably classic in form, and its five-layer filter looked equally promising, advertising in particular KDF-55 and activated carbon. Home testing didn’t show great results with my chloramine-treated water, however, and for the price I felt entitled to high expectations. Requests for independent lab testing data in 2024 didn’t get results.
Act + Acre Showerhead Filter for $120: Beauty company Act + Acre’s filtered showerhead didn’t perform as well as others in my home testing of total chlorine. We also didn’t fall in love with the showerhead itself, which looks a bit like a gooseneck desk lamp and droops awkwardly from the shower pipe.
Frequently Asked Questions
How We Tested and What We Tested
Photograph: Matthew Korfhage
The market for filtered showerheads remains young and largely unregulated, and performance claims are only rarely backed up publicly by independent data. We made lots of requests, but few shower filter companies hand over their lab results. (Thank you Rorra, Aquasana, Weddell, Croix, and Curo for being exceptions.)
Some makers told us that independent labs and certifying bodies have been backed up, and that data is forthcoming. Many offered customer satisfaction surveys or anecdotal studies instead. This all means that some skepticism is warranted.
And so I also got out test kits at home. First I test the total chlorine levels in the water without any filtering, a measure that includes either chloramine or free chlorine that’s interacted with whatever’s in your pipes. Then I test the water filtered by the showerhead. I perform each test multiple times to account for imprecision or fluctuations in testing and in municipal chlorine levels. In most cases, I do this over multiple days upon initial testing to account for any inconsistencies in my own water supply.
For testing, I avoided painfully unreliable home test strips, and instead got out somewhat nasty chemical indicators and used digital and chemical tests designed for pools and aquariums.
We also tested total dissolved solids using a TDS meter, and separately tested filters’ effects on pH in order to gauge effects but also to verify the reliability of chemical test results.
The effectiveness of filters goes down over time, of course, depending on how much contamination is filtered out of the water—which is why filters always need to be changed. As we update this guide, we continue to test the most effective showerhead filters to see how their efficacy changes over time—and add any new shower filters we’re able to recommend.
What Does a Shower Filter Do?
The biggest thing that most shower water filters tackle, in a measurable way, is filter chlorine and chlorine compounds, mostly through chemical reactions. Pretty much every American city adds low concentrations of chlorine or chlorine compounds to drinking water to kill potentially harmful bacteria. This is all well and good when the water’s still in the pipes. But chlorine’s not exactly great for your hair or your skin, and few people like to drink it. Some are also especially sensitive to the taste or smell, or prone to skin reactions.
The most prominent home shower filters rely in part on a zinc-copper mixture called KDF-55, known to be quite effective at neutralizing “free” chlorine in chlorine-treated systems. Other common substances used to treat chlorine and chlorine compounds include calcium sulfite and activated or catalytic carbon. The most effective filters use these in some combination. The main thing I was able to test and verify was the best shower water filters’ ability to remove the total chlorine content of water coming out of your shower.
We’ve seen little evidence that the most common types of showerhead filters have much effect on the softness or hardness of water, or on calcium buildup. In fact, some early academic studies present evidence that they don’t. The shower filters we tested also had very little effect on the sum total of dissolved solids in our water, according to measurements with a TDS meter—i.e., the filters aren’t removing a large amount of materials or minerals from the water.
I wasn’t able to test claims by some companies that these filters remove heavy metals like lead and arsenic, which thankfully aren’t in my pipes. We only found one company, Weddell, whose filter was certified to remove leadr. So far, so good! Nonetheless, if you believe you have dangerous lead or arsenic in your water, you probably shouldn’t try to fix the problem with a mail-order showerhead. Talk to a water treatment professional or your public health authority.
Does My City Use Chlorine or Chloramine?
If you live in a major US city, chlorine is likely not what your city uses to treat the water in its pipes. New York, Chicago, Seattle, and Phoenix use chlorine, sure. But Los Angeles, Philadelphia, Atlanta, Boston, and most big cities in Texas don’t.
More than half of American big cities use a substance called chloramine, a more stable and enduring chemical that’s harder to filter and test. That’s also what was in my water supply. To test, I got out my handy digital water colorimeter and a somewhat nasty chemical indicator, and then tested the ability of each shower filter to treat any of a number of chlorine compounds in the water.
Curious whether your city uses chlorine or chloramine as a disinfectant in your pipes? Check here for an accounting of the 50 biggest municipal water systems in the United States.
Are Shower Filters Effective for Hard Water?
No, probably not.
The best shower filters I tested will improve your water quality, largely by removing chlorine and chloramine compounds—and other contaminants that may include heavy metals.
But shower filters can only do so much. You probably shouldn’t expect these shower filters to soften the mineral hardness of your water or remove most substances, which derives mostly from dissolved calsium and magnesium salts in your water.
After all, a filter must be relatively small to fit into a showerhead. And yet it’s being asked to filter gallons of water each minute, pushed out at both high temperature and high pressure. A showerhead filter poses a daunting engineering challenge, as compared to countertop water filters that treat only a small amount of water at a time—or a bulky reverse-osmosis device that can plug into your under-sink plumbing
Hard water is more often solved by specific water softeners, reverse osmosis filters, and whole-house water filtration systems. Some early studies show that a number of shower filters may even add a small amount of hardness to your water, via calcium sulfite filters,
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Tech
Study of Buddhist Monks Finds Meditation Alters Brain Activity
If you’ve ever considered practicing meditation, you might believe you should relax, breathe, and empty your mind of distracting thoughts. Novices tend to think of meditation as the brain at rest, but a new international study concludes that this ancient practice is quite the opposite: Meditation is a state of heightened cerebral activity that profoundly alters brain dynamics.
Researchers from the University of Montreal and Italy’s National Research Council recruited 12 monks of the Thai Forest Tradition at Santacittārāma, a Buddhist monastery outside Rome. In a laboratory in Chieti-Pescara, scientists analyzed the brain activity of these meditation practitioners using magnetoencephalography (MEG), technology capable of recording with great precision the brain’s electrical signals.
The study focused on two classical forms of meditation: Samatha, a technique that focuses on sustained attention to a specific objective, often steady breathing, with the aim of stabilizing the mind and reaching a deep state of calm and concentration, and Vipassana, which is based on equanimous observation of sensations, thoughts, and emotions as they arise in order to develop mental clarity and a deeper understanding of the experience.
“With Samatha, you narrow your field of attention, somewhat like narrowing the beam of a flashlight; with Vipassana, on the contrary, you widen the beam,” explains Karim Jerbi, professor of psychology at the University of Montreal and one of the study’s coauthors. “Both practices actively engage attentional mechanisms. While Vipassana is more challenging for beginners, in mindfulness programs the two techniques are often practiced in alternation.”
The researchers recorded multiple indicators of brain dynamics, including neural oscillations, measures of signal complexity, and parameters related to so-called “criticality,” a concept borrowed from statistical physics that has been applied to neuroscience for 20 years. Criticality describes systems that operate efficiently on the border between order and chaos, and in neuroscience, it is considered a state optimal for processing information in a healthy brain.
“A brain that lacks flexibility adapts poorly, while too much chaos can lead to malfunction, as in epilepsy,” Jerbi explained in a press release. “At the critical point, neural networks are stable enough to transmit information reliably, yet flexible enough to adapt quickly to new situations. This balance optimizes the brain’s processing, learning, and response capacity.”
During the experiment, the monks’ brain activity was recorded by a high-resolution MEG system as they alternated from one type of meditation to the other with brief periods of rest in between. The data were then processed with advanced signal analysis and machine learning tools to extract different indicators of neural complexity and dynamics.
Striking a Balance
Results published in the journal Neuroscience of Consciousness show both forms of meditation increase the complexity of brain signals compared to a brain at rest. This finding suggests the brain in meditation does not simply calm down but rather enters a dynamic state rich with information. At the same time, the researchers observed widespread reductions in certain parameters linked to the global organization of neural activity.
One of the most striking findings in the analysis of the criticality deviation coefficient showed a clear distinction between Samatha and Vipassana. This indicates that, although both practices increase brain complexity, they do so through different dynamic configurations, consistent with their subjective experiences. In other words, Vipassana brings the practitioner closer to the balance of stability and flexibility, while Samatha produces a somewhat more stable and focused state. According to researchers, the closer the brain gets to this critical state of balance, the more responsively and efficiently it functions. This is reflected, for example, in a greater capacity to switch tasks or to store information.
Tech
‘Heated Rivalry’ Is Bringing New Fans to Hockey. Does the Sport Deserve Them?
The NHL also pointed WIRED to its partnerships with Pride organizations around the US, Canada, and Australia, as well as pro-inclusivity organization You Can Play, which it’s been working with since 2013. The league said it will be hosting its third annual Pride Cup in 2026.
NHL Commissioner Gary Bettman has said he “binged” Heated Rivalry in one night and told reporters that all NHL teams do a Pride night. However, as the New York Times reported, that is no longer the case, with a couple of teams opting for more general inclusivity events.
Teresa Fowler, an associate professor at Concordia University of Edmonton and Tim Skuce, an associate professor at Brandon University, have both been researching hockey culture in Canada for years. Fowler is candid when she speaks about the league’s embrace of Heated Rivalry, which she feels is performative.
“Where’s your gay friend on your team? You know what I mean?” she says. “It just seems so hypocritical when people are saying, ‘Yeah, we would welcome them,’ and yet, the person who they call their brother, you know, that they would do anything for, is too afraid to bare their soul.”
Fowler and Skuce published a study on hockey culture in 2023, interviewing 21 elite players from the junior A level and higher, many of whom they say were current or former NHL players. Fowler says she’s also worked with younger players, including U18 players and youth hockey. One of the main issues they pointed to that fosters a toxic culture in sport was hazing.
“They would make players dress up like women, and then go into a shopping mall and sing ‘My Little Teapot.’ They would have notches in their belts for sexual conquest. But then, of course, there’s the more physical [hazing rituals]: drag your testicles across the rink naked, get in bathrooms naked,” Fowler says. “It’s just gross. It makes no sense to me how this is team bonding, none whatsoever. Those rituals are sexism rituals, misogynistic rituals, where you’re constantly demeaning women.”
In 2022, a Globe and Mail investigation revealed that Hockey Canada, the sport’s national governing body, had in part used players’ registration fees to cover uninsurable liabilities, such as sexual assault settlements; last July, five former Canadian Junior Hockey players were acquitted of sexually assaulting a woman at a hotel room in London, Ontario.
Hockey Canada did not respond to WIRED’s request for comment.
Skuce, who played university and AAA hockey, says a lot of the men he’s interviewed said they “felt uncomfortable” with the hazing but “they didn’t want to say anything about it.” Team belonging is predicated on going along with what’s happening.
Skuce says he wants to see a shift away from humiliation-based hazing rituals to ones that are more “inclusive.”
With the Olympics taking center stage, there’s once again the potential for a spotlight on trans people in sports—a culture war issue Browne says has created a “moral panic.” He coauthored the 2025 book Let Us Play about the issue.
Tech
ICE Is Crashing the US Court System in Minnesota
The Immigration and Customs Enforcement (ICE) operation in Minnesota is pushing the United States court system to its breaking point.
Since Operation Metro Surge began in December, federal immigration agents have arrested some 4,000 people, according to the Department of Homeland Security (DHS). The result is an avalanche of cases filed in the US district court in Minnesota on behalf of people challenging their imprisonment by federal immigration enforcement agents. According to WIRED’s review of court records and official judicial statistics, attorneys filed nearly as many so-called habeas corpus petitions in Minnesota alone as were filed across the US during an entire year.
The bombardment of cases filed in federal court in Minnesota and other states is the result of two Trump administration policies: a dramatic increase in the number of people being detained, and the elimination of a key legal mechanism for securing their release. The result is a US court system in collapse: Judges, immigration attorneys, and federal prosecutors are all overwhelmed, while the people at the center of these cases remain behind bars, often in states thousands of miles from their home—many after judges have ordered their release.
“I’ve never said the word habeas so many times in my life,” says Graham Ojala-Barbour, a Minnesota immigration attorney who has been practicing for over a decade. Ojala-Barbour says that when he goes to sleep, his dreams are about habeas petitions.
Exhaustion is endemic. On February 3, one now-former special assistant US attorney, Julie Le, begged a US judge in Minnesota to hold her in contempt so she could finally rest. She was listed on 88 cases, according to data obtained via PACER, the US court records database. Daniel Rosen, the US attorney for the district of Minnesota and head of Le’s office, previously told that judge in a letter that they were “struggling to keep up with the immense volume” of petitions and had let at least one court order demanding the return of a petitioner slip through the cracks. Le did not respond to a request for comment. In response to a request for comment, the Minnesota US Attorney’s Office sent an automatic reply stating that they currently lacked a public information officer.
Le was reportedly fired after the February hearing, where she told the judge, “This job sucks.”
In response to a request for comment, DHS spokesperson Tricia McLaughlin said, “The Trump administration is more than prepared to handle the legal caseload necessary to deliver President Trump’s deportation agenda for the American people.”
As hard as the workload may be for US attorneys, the situation is far more dire for people detained by immigration authorities. In court filings, people who have been detained describe being packed into cells that were so full that they couldn’t even sit down before being flown to detention centers in Texas. One described having to share cells with people who were sick with Covid. Others said agents repeatedly pressured them and other detainees to self-deport.
McLaughlin told WIRED, “All detainees are provided with proper meals, water, medical treatment, and have opportunities to communicate with their family members and lawyers. All detainees receive full due process.”
Ana Voss, the civil division chief for the Minnesota US Attorney’s Office, has been listed as one of the attorneys defending the government in nearly all the habeas petition cases filed in Minnesota since Operation Metro Surge began. Before December, the majority of cases associated with Voss were about other issues, such as social security and disability lawsuits. Since then, habeas petitions for immigrant detainees have dramatically overtaken all other matters.
In January, 584 of the 618 cases filed in Minnesota district court that included Voss as an appearing attorney were categorized as habeas petitions for detainees, according to a WIRED review of PACER data. This is likely an undercount due to incorrect “nature of suit” labels. Voss is no longer with the Minnesota US Attorney’s Office, according to an automatic reply from her Department of Justice email address.
The number of habeas petitions filed has exploded in other parts of the country as well. In the western district court of Texas, for example, at least 774 petitions were filed in the month of January, according to data collected by Habeas Dockets. In the Middle District of Georgia, 186 petitions were filed that same month. ProPublica reported that across the country, there have been over 18,000 habeas cases filed since January 2025.
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