Itchiness, tightness, redness — most people blame their soap choice. But research points to another culprit.
Dry skin after showering is most often caused by chlorine and minerals in the water, not by your skincare. Chlorine oxidizes the skin's natural lipid barrier. The solution is a calcium sulfite shower filter.
Why does my skin feel dry after showering?
The classic advice is to use milder soap, fewer products, and shower for shorter periods. Good advice — but it doesn't solve the root problem for most Swedish households.
Research from the British Journal of Dermatology (2018) showed that participants in hard water areas (more than 250 mg/L calcium carbonate) had 27 percent lower skin moisture after four weeks compared to controls in soft water areas (less than 100 mg/L). And if the water also contains chlorine — which Swedish municipalities often do — the effect is amplified.
Two separate mechanisms are at play simultaneously: Chlorine's oxidation of the skin's lipid barrier, and mineral deposits from calcium and magnesium forming soap scum on the skin.
What does chlorine do to the skin?
Chlorine (or chloramine, which Stockholm, Gothenburg, and Malmö use) is an oxidant. It is designed to kill bacteria — but it does the same thing to skin cells.
When chlorine comes into contact with the skin's fatty acids, irritating byproducts are formed. Dermatologists call this chlorine's oxidative stress on the skin.
A study published in Environmental Science & Technology (2004) showed that inhaling chlorine vapor during a 10-minute shower can lead to greater chlorine exposure than drinking eight glasses of chlorinated water. Dermatologists at Karolinska Institutet have confirmed that chlorinated water is a documented risk factor for contact dermatitis and dry skin.
According to Karolinska Institutet, chlorinated water is a documented risk factor for contact dermatitis. Dermatologists researching at KI's Department of Dermatology in Huddinge have published work confirming that regular exposure to chlorinated water negatively affects the skin barrier.
Read more on 1177 Vårdguiden: Dry skin and itchiness
Read more on 1177 Vårdguiden: Dry skin and itchiness
Hard water plus chlorine doubles the effect
In Swedish households with older properties and shared hot water heaters, shower water is often both harder and more chlorinated than what municipal water quality reports suggest. Hot water dissolves more scale, and longer contact time in the heater increases corrosion. According to Svenska Vatten och Avfallshantering (SVAVA), water hardness varies significantly between Swedish municipalities — from about 30 mg/L in Stockholm to 40–80 mg/L in Skåne and Blekinge.
See our guide to water hardness in Swedish cities to understand what applies to your municipality and postcode.
According to Svenska Vatten och Avfallshantering (SVAVA), water hardness varies significantly between Swedish municipalities — from about 30 mg/L calcium carbonate in Stockholm to 40–80 mg/L in Skåne and Blekinge.
SVAVA: Water hardness in Swedish municipalities
SVAVA: Water hardness in Swedish municipalities
The solution: Step by step
1. Install a shower filter with calcium sulfite
A quality shower filter chemically neutralizes chlorine and chloramine. Unlike activated carbon — which loses capacity at shower temperatures — calcium sulfite maintains its effectiveness even in hot water.
Read more about how calcium sulfite works
2. Shorten your shower
5 minutes instead of 15 minutes dramatically reduces accumulated chlorine exposure.
3. Moisturizer within 3 minutes
Apply a ceramide-rich moisturizer to damp skin immediately after showering. This traps water before it evaporates.
4. Sulfate-free cleansing products
pH-balanced products compensate for alkaline water and do not further damage the skin barrier.
Frequently Asked Questions
How do I know if the water is causing my dry skin?
Test: Shower with filtered water for two weeks and compare the condition of your skin. A chlorine test kit (DPD tablets, approx. 150 SEK) will show if your water contains chlorine.
Can a shower filter replace my moisturizer?
No — the shower filter removes the cause (chlorine and minerals). Moisturizer treats the symptom (dryness). Both are needed for best results.
I have eczema. Can a shower filter help?
Research from the University of Sheffield (2018) showed that calcium and magnesium ions activate inflammatory signaling pathways in eczema cells. A shower filter can be a meaningful part of the treatment.
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Nordisk Shower Water Filter
Calcium Sulfite + KDF-55D + GAC. Designed for Scandinavian hard, chlorinated water.
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