What are the commont myths and facts about shower water?
Just like with drinking water filters there are a lot of companies and “health experts” that spread unscientific or even false information for their own benefits. Blogs and the Amazon marketplace are filled with false myths about showering water and water filtration benefits. Therefore we’ve tried to capture the most common myths about shower water related issues to your skin, hair and health.
1. The skin absorbs chlorine when showering
Some blogs and websites claim that a 10-minute shower causes your body to absorb the equivalence of 8 to glasses of chlorinated drinking water.
The health risks caused by chlorine absorption are explained as follows in a paper by The Department of Community Health in Michigan:
“The skin does not absorb chlorine well, but small amounts can pass through the skin when people are exposed to chlorine gas, bleach, or come into contact with water or soil containing high levels of chlorine. Although small amounts of chlorine can pass through the skin, it is eliminated from the body rapidly. Chlorine may irritate or burn the skin, especially moist areas.”
2. Chloroform (one of the THMs) which may be cancer-causing can is a by-product from showering in chlorinated hot water
There is plenty of evidence and research that shows that we may inhale THMs from chlorinated tap water.
Science News reported that researchers found increases in chloroform in study participants’ lungs of about 2.7ppb after a 10-minute shower. Combined with warm water opening pores, skin absorption and lung inhalation during a 10-minute shower showed to be greater than the amount that would be ingested by drinking 8 glasses of the same water.
The EU has also recently published several studies showing that elevated levels of chlorine by-products such as THMs increase the risk of bladder cancer causing deaths per year in Europe.
Therefore we should be wary of total THMs above the maximum limit (100 ppm) in our tap water.
References to two of the studies:
Most shower filters don’t remove THMs due to the high water pressure. However, ProShower that combines KDF 55 and activated carbon have proven to reduce THMs and VOCs based on independent tests.
3. Chlorine in shower water can lead to hair loss
Normal exposure to chlorine does not cause hair loss. This myth has been debunked after a study was published in a recent issue of the journal of dermatologist . In the study, researchers compared the hair of 67 professional swimmers to that of 54 individuals who spent little to no time in the pool. Although swimmers’ hair exhibited signs of chlorine-induced damage (i.e. dryness and coarseness), swimmers were not significantly more likely to experience hair loss.
However, there is evidence that abnormally high exposure to chlorine might cause the scalp to become agitated, dry, and flaky. Thinning or shedding might occur as a result, but it’s important to understand that the chlorine exposure needed to bring about such side effects far exceeds that of a normal swimming pool.
4. Facts about water: Shower filters remove all chlorine
Good filters remove 90% or more but there are filters that don’t remove chlorine at all. The ones that claim 99% removal are most likely made up results. Amazon is full of cheap Chinese and Korean shower that remove a small proportion of chlorine despite the raving reviews. Filters certified by the NSF #177 Standard (the US water filter standard) — only indicates that a filter will remove 50% of free chlorine in the water. ProShower is tested to filter over 90%.
Make sure that the the manufacturers provide independent test results for their filters before buying.
5. KDF shower filters are the most effective at removing chlorine
KDF removes “free chlorine” (chlorine that has not combined with other constituents in water) under heavy pressure with hot water. Carbon filters are virtually useless in showers, because they do not work when the water is warm, high pressure and they also get clogged fairly quickly.
The claim that Vitamin C filters remove chlorine is more complicated. We’ve tried to find independent research that shows the effectiveness without success. Vitamin C does work in the bathtub though as there is sufficient time for the water and Vitamin C to mix.
In an interview by Bloomberg Neal Langerman at the American Chemical Society Division of Chemical Health and Safety. “From a chemistry standpoint, vitamin C does react with chlorine and consume it. The concept has even been proven by the U.S. Department of Agriculture. But the filters are all hype. First off, chlorine and chloramines do not cross the skin barrier, nor does vitamin C. … [Also] I don’t think the reaction would be complete—the neutralization, if you will—by the time the water hits your head or flows down the drain.”
The conclusion from our research is that Vitamin C is most like insufficient on it’s own but combined with KDF it could be.
6. Shower filters soften the water?
A shower filter will not soften water in the way a traditional softener does, but it will remove chlorine and other chemical contaminants, making the water much less harsh and leaving your skin and hair feeling significantly softer. In addition to this shower filters with KDF will significantly reduce limescale formation.
7. Shower filters reduce water pressure?
Most shower filters process water at 10 Liters (2.5 gallons) per minute, which is the same flow regulation as a standard shower head. However, it’s not a bad idea to combine your filter with a water saving shower head to save water consumption and money. You can find a list and review of shower heads here.
8. Shower filters last 12 months or more
Based on two 10-minue showers per day normal shower filters will last a maximum of 3-6 months. Most filters significantly shorter. Always make sure that the manufacturer provides a report on the capacity. Unfortunately it’s difficult to notice the difference between fully effective and partially so better be safe than sorry and change as frequent as the manufacturer recommends.
9. Vitamins C infused shower filters are better for the skin
According to Patricia Farris, a doctor that specialises in dermatology Vitamin C has lots of benefits for the skin. It can be absorbed through the skin if it is formulated properly. Vitamin C can soften lines and wrinkles by boosting collagen production, lighten hyperpigmentation, and protect the skin from UV damage.”
But will it work with a shower filter?
“Most likely not. While a vitamin C-infused shower sounds good in theory, it will probably provide very little skin benefit,” says Farris. “Vitamin C must be formulated and packaged in a very careful way in order to stabilize it and prevent it from becoming oxidized [which makes it ineffective]. If it’s just sprayed out of the shower, the majority of it will be inactivated rather quickly as it is exposed to air.”
Source: Mens Health
There is no scientific evidence that Vitamin C showers benefit the skin.
10. Showering and bathing with chlorinated water could pose a risk for pregnant women and children
There is some evidence that CBPs affect fetal growth, and your genes may influence how much of an effect CBPs have during pregnancy. Source: Genefood
A study conducted by a team in Russia determined that women who drank or took showers in unfiltered water laced with chlorine and chloramine contamination resulted in various complications with the pregnancy, including spontaneous abortions, stillbirth, low birth weight, premature delivery, and a spectrum of birth defects ranging from nerve damage to weak hearts. Source: NIH
For children, a hot bath or shower with unfiltered municipal water could have dangerous effects on their development. In Belgium, a study was done to find out if there was any correlation between school children who spent time breathing the air in an indoor swimming pool and an increase in lung permeation and the development of asthma. Children who played frequently at the pool had an increased risk of developing juvenile asthma, and in some cases the symptoms were severe. Source: NIH
They also had more damaged epithelial tissue, which is the tissue that makes up the outer layer of skin and lines the insides of the lungs. This study confirms just how harmful chlorine vapors can be for a child’s respiratory system, not just in community pools, but at home in showers and baths, too.
Real conclusions can not be drawn from the limited studies, especially not since no studies specifically on the effects of showering in relation to pregnancy have been done. Considering the other health hazards it may be wise to be better safe than sorry though. Use a shower filter such as ShowerPro.
Did you know all of this about water in your shower before? Did we miss anything?
ShowerPro Filter by TAPP Water is available to buy on our website and Amazon in the UK, Germany, Spain, Italy and France.
Learn more about ProShower and the benefits of using a shower filter.
Also read our article on myths about limescale in tap water, common myths about drinking water and myths about bottled vs tap water.
17 thoughts on “10 Myths and Facts about your Shower Water”
i received an e-mail about filters and i do not want any filters sent to me at this time i will contact you when i need more thank you virginia weber
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The TAPP Water team
Its common knowledge that if you spend ten minutes showering you are breathing in the poisonous chlorinated steam which is pathogenic potentiating existing diseases. Spend as little time as poss in the shower at the lowest heat you can be comfortable with Sitting in the tub reading a book doesnt fare much better run the cold first then the hot gives off less harmful steam.
Sometimes common sense outpaces science in that training stifles instinct in many ways.
What is the source of this information? Wouldn’t this mean every teenager in Europe would die an early death and that life expectancy would go down over the past 20 years? We should be careful about drawing too many conclusions from preliminary research. Although it’s true that hot water mixed with chlorine may cause dangerous chlorine by-products.
The TAPP Team
Can you please provide the link to the English study you mention in this paragraph? ‘A study conducted by a team in England determined that women who drank or took showers in unfiltered water laced with chlorine and chloramine contamination resulted in various complications with the pregnancy, including spontaneous abortions, stillbirth, low birth weight, premature delivery, and a spectrum of birth defects ranging from nerve damage to weak hearts.
Great question. Here are the main sources for the article:
The TAPP Team
Thanks for the feedback. You are absolutely right. Our mission is to reduced bottled water consumption and not to scare people away from tap water or showering. We will review and update.
Regards, TAPP Water Team
Can you comment on the efficacy of Calcium Sulfite in the removal of “chlorine” and Chloramines from shower water at the 2.5 gpm flow rate? I would expect a one way binding chemical reaction to be faster than adsorption, but I can find no data.
Thank you for the question. Read the report by KDF on this topic:
The TAPP Team
I would like to remove chlorine from my shower with a filter, because I am under the impression it will be better for my dry skin and hair. Is that correct? I am having a hard time finding one that gets mostly good reviews and doesn’t leak, etc. I live in the US. I understand KDF is the best material.
You are absolutely right. Reducing chlorine will have a positive impact on most peoples skin and hair. Unfortunately TAPP 1s / ProShower is not available in the US. We will consider launching it in the coming year.
Make sure you buy a shower filter that is independently tested. Most shower filters that we’ve tested do almost nothing. Vitaminc C, various crystals, etc are not efficient at filtration at high pressure warm water.
The TAPP Water Team
Durability is another factor to consider when you are trying to choose the right shower faucet. Shower valves are made from many different materials, including brass, chrome, iron, tungsten, and many other options.
Most people in my area have no knowledge of the fact that shampoos that grow your hair fast (obviously with no sulfates, no parabens or DEA) even exist. Hair styling enthusiasts are now able to enjoy longer hair and attain more alternatives. Certainly worth checking out.
When you’re going over alopecia, damaged hair, avoiding scalp disorders, hair growth, hair and scalp health more often than not, similar principles apply.
For the most part, you will want to stay away from hair products and treatments that contain chemicals such as parabens, DEA or sulfates.
What’s good for your hair is good for your skin also.
Clearly the content here is spot on for so many reasons. It stays away from the common mistakes and mistakes so many fall into: using defective alternatives. Greatly appreciated!
Thanks. You are absolutely right. And you want water without chlorine and limescale of course.
The TAPP Water Team
So many people have no idea that fast growth shampoos (of course without any sulfates, parabens or DEA) are even a thing. Hair styling enthusiasts are now able to achieve longer hair and possess more options. Definitely worth investigating.
When you’re considering alopecia, damaged hair, avoiding hair disorders, fast hair growth, hair health normally, similar thoughts become relevant.
For the most part, you will want to steer clear of hair products and treatments that use chemicals like parabens, DEA and sulfates.
What is beneficial for your hair is beneficial for your skin also.
For obvious reasons the content here is so useful for various reasons. It stays away from the usual mistakes and mistakes too many fall into- purchasing bad alternatives. Thank you so much!
Is there any information about phosphorus silicon water filtration, specifically for removing chloramines? I could not find anything about it.
So your question is if phosphorus silicon water filters remove chloramine? Our assumption would be no. It will reduce limescale formation but not chloramine. Our experience is that the best to reduce chloramine is catalytic activated carbon as we use in EcoPro.
The TAPP Water Team