Driven by Science

The Problem. Common Water Contaminants

Nordisk Renhet is committed to leveraging scientific understanding to enhance well-being, starting with the often-overlooked element of water quality. Many households receive water that, while treated, still contains hard minerals, chlorine, heavy metals, and other contaminants. Scientific studies have demonstrated how these impurities contribute to skin irritation, dryness, and other concerns. By addressing these issues, Nordisk Renhet aims to provide a foundation for healthier skin and improved quality of life.

Inside the filter

KDF 55

KDF 55 is a specialized filtration media made from a copper-zinc alloy, designed to remove chlorine, heavy metals, and other harmful impurities commonly found in water. This process, known as redox (reduction-oxidation), helps eliminate contaminants like chlorine and lead, providing cleaner and safer water for the skin and hair.

By removing these impurities, KDF 55 enhances water quality, which can help prevent skin dryness, irritation, and damage to hair caused by chlorine and metals. It’s particularly beneficial for individuals with sensitive skin or hair that are prone to damage from harsh water contaminants.

Incorporating KDF 55 into your shower filter ensures you get purified water that’s gentler on your skin and hair, leaving you with a cleaner and more refreshing shower experience.

Calcium Sulfite

Calcium Sulfite works by breaking down chlorine and chloramine, two common disinfectants used in municipal water supplies. These compounds can dry out skin and cause hair damage, so removing them can significantly improve your shower experience.

This filtration process neutralizes chlorine and chloramine, leaving behind water that is less harsh on the skin and hair. As a result, you may notice softer skin, shinier hair, and a more comfortable shower overall.

Incorporating Calcium Sulfite into the filtration system helps to ensure your water is free of harmful chemicals, providing a safer and more soothing shower.

Activated Carbon

Activated Carbon is a filtration material with a large surface area, making it incredibly effective at absorbing unwanted chemicals, chlorine, and other organic contaminants. This process helps remove odors, harmful substances, and unpleasant tastes, leaving your water cleaner and fresher.

By removing chlorine, volatile organic compounds (VOCs), and other chemicals, Activated Carbon helps to enhance the overall quality of the water you use for bathing. This means a more pleasant shower experience, with less irritation to the skin and hair.

Incorporating Activated Carbon into your filter system improves both the water’s purity and your shower's refreshment, making it more beneficial for your skin and hair health.

High Fiber PP Stainless Steel Filter (Casing Material)

The casing is made from a blend of high-fiber polypropylene (PP) and stainless steel, offering a robust protective layer for the filtration components. The stainless steel adds strength and resilience, ensuring that the filter maintains its shape and function even with continuous use. The high-fiber PP provides added flexibility and resistance to wear, making it a reliable choice for long-term durability.

This material ensures that the filter stays intact while withstanding the rigors of daily use, offering a long-lasting solution for effective water filtration. The combination of these materials makes the casing resistant to corrosion, ensuring that the filter remains efficient over time, even in humid and wet conditions.

By incorporating a High Fiber PP Stainless Steel Filter casing, the system benefits from a sturdy structure that not only enhances filtration efficiency but also extends the lifespan of the product, making it a trusted choice for long-term water purification.

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Heavy Metals & Other Impurities

Water may contain heavy metals such as lead, mercury, and nickel, which have been linked to oxidative stress and skin inflammation

KDF 55 and 85, or KDF-C media removes up to 98% of heavy metals

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Skin Soother. Irritation Reduced.

Washing with hard water leaves behind more surfactant residues like SLS, which can weaken the skin barrier:

  • SLS disrupts skin proteins, strips protective lipids, and raises pH, causing irritation.
  • Those with atopic dermatitis (AD) and FLG mutations are especially sensitive, experiencing greater skin damage.
  • Hard water worsens these effects, increasing lipid disorder and protein breakdown.
  • Water softeners help by removing calcium and magnesium, reducing SLS buildup and irritation.

This underscores the importance of water quality in protecting skin health during everyday washing.

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Hair Health. Before & After.

Everyday environmental factors can weaken the skin barrier and impact skin health:

  • Hard water, allergens, and bacterial toxins lower Natural Moisturizing Factor (NMF), reducing skin hydration.
  • Daily stressors trigger inflammation, increasing skin cytokine levels even in healthy skin.
  • Within 48 hours, these stressors weaken the skin barrier, leading to higher transepidermal water loss (TEWL).
  • Low humidity speeds up filaggrin breakdown, making it harder for skin to retain moisture.

Minimizing exposure to harsh water and irritants is key to maintaining a strong, healthy skin barrier.

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Skin Moisture.

Everyday environmental factors can weaken the skin barrier and impact skin health:

  • Hard water, allergens, and bacterial toxins (like Staphylococcus aureus enterotoxin B) reduce Natural Moisturizing Factor (NMF), essential for skin hydration.
  • Daily stressors trigger inflammatory responses, increasing skin cytokine secretion—even in healthy individuals.
  • Within 48 hours, these stressors cause skin barrier deterioration, shown by increased transepidermal water loss (TEWL)—a key sign of skin damage.
  • Low humidity accelerates filaggrin breakdown, making it harder for skin to retain moisture.

This highlights the need to limit exposure to harsh water and environmental irritants to keep the skin barrier strong and healthy.

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Eczema Prevalence.

Exposure to hard water has been linked to a higher risk of eczema, especially in children:

  • Every 50 mg/L increase in water hardness slightly raises eczema risk.
  • Hard water above 200 mg/L (WHO threshold) is significantly associated with eczema.
  • Studies show a clear trend—the harder the water, the greater the risk.
  • Hard water forms as minerals dissolve from limestone and sedimentary rocks.
  • It reduces soap effectiveness, leading to residue buildup on skin.
  • Early-life exposure may trigger skin inflammation, though risk decreases with age.

This highlights the role of soft water in maintaining skin health and preventing irritation.

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Chlorine.

Exposure to high chlorine levels in water can be harmful to skin cells (keratinocytes), especially over time:

  • A 15-minute exposure to 200 mg/L of chlorine was toxic to both normal and scarred skin cells.
  • Even at a lower concentration of 100 mg/L, exposure over 1 to 3 consecutive days caused significant damage.
  • Scarred skin cells (hypertrophic scars) were more vulnerable to chlorine than normal skin cells, showing increased sensitivity and damage.
  • Overall, chlorine at 100 mg/L severely harms growing skin cells, with an even greater impact on scarred tissue.

This suggests that prolonged exposure to high chlorine levels weakens skin health, especially for those with sensitive or damaged skin.
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