5 Tips to Elevate Your Filtered Shower Experience

Simple steps to optimize your Nordisk Renhet shower filter for the cleanest water, softer skin, and healthier hair — every single day.

Nordisk Shower Filter Cartridge Nordisk Renhet

Step 1

Give Your Filter a Fresh Start

Before your first shower, run warm water through your new filter for 30 seconds. This helps flush out any loose carbon particles and activates the filtration media.

Step 2

Keep Water Temperature in Check

Extremely hot water can dry out your skin and weaken the effectiveness of the filter. Keep your showers warm but not scalding to maintain hydration and maximize filtration.

Step 3

Pair It With Gentle, Sulfate-Free Products

Hard water and chlorine-free showers work best with gentle, sulfate-free shampoos and soaps. This helps your skin and hair retain moisture naturally, reducing the need for extra products.

Step 4

Clean Your Showerhead Every Few Weeks

While the filter works to purify water, occasional limescale buildup on the showerhead is normal. A quick rinse or soak in a vinegar-water solution helps maintain water flow and pressure.

Step 5

Stay on Top of Filter Replacements

To keep your water fresh and clean, replace your filter every 13,000 liters (approximately every 3–6 months, depending on usage). Subscribe and never worry about missing a replacement!

Enjoy the cleanest, most refreshing showers with Nordisk Renhet!

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Our Mission

Empower individuals to enjoy cleaner, healthier showers so they can live better.

We believe that a refreshing, pure shower is the foundation for a healthy and vibrant life.

We believe you can't achieve your best self without taking care of your skin and hair daily.

And that a revitalizing shower is far better than any quick fix.

Everything we create is driven by our passion to enhance your life through cleaner, more invigorating showers.

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Understanding the Science Behind Hard Water's Impact

Hard Water and Eczema Risk:

Children in elementary/primary school exposed to hard water may experience a 43% increased risk of eczema.

A meta-analysis showed increased odds of atopic eczema in children exposed to harder water.

Living in a hard water area is associated with an increased risk of atopic dermatitis (AD).

One study noted a statistically significant increased risk of atopic eczema in primary school-aged children exposed to hard water (OR 1.43; 95% CI 1.09, 1.87).

Hard water may contribute to the development of atopic eczema in early life.

Hard Water, Skin Barrier Function, and TEWL:

People with eczema and a specific gene mutation (FLG) experience almost double the skin dryness after washing with harsh soaps in hard water.

Atopic Dermatitis (AD) patients with a filaggrin (FLG) mutation showed a 94% greater increase in TEWL after being washed with sodium lauryl sulfate (SLS) in hard water.

Hard water can reduce skin barrier function, regardless of chlorine levels.

The increase in TEWL correlates with the amount of SLS deposited on the skin.

Water softening mitigates the negative effect of hard water on skin barrier function.

Hard Water and Surfactant Deposition:

Hard water can cause almost three times as much soap (SLS) to stick to your skin.

Hard water is associated with 2.8 ± 0.6-fold greater SLS deposition on the skin compared to deionized water.

High calcium levels in hard water reduce the solubility of surfactants, increasing their deposition on the skin.

Hard water increases skin exposure to harmful surfactants.

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