When Dr. Dorothee Mitterweger sees a new patient, she always asks the same question most dermatologists skip: "What water do you use to wash your face?"
The answer is almost always the same — tap water. And for most women, that answer is exactly where the problem begins.
"Contaminated tap water can have a significant influence on your skin barrier," she explains. "And yet almost nobody thinks to question the water — only the products."
Standard municipal tap water contains chlorine (used for disinfection), limescale (calcium and magnesium deposits), heavy metals such as lead and copper from aging pipes, microplastics, and in some areas traces of pharmaceutical residues and bacteria. These aren't visible — but they touch your skin every single day.
What happens when these substances meet your skin barrier?
The skin barrier — the outermost layer of the skin — is a finely tuned system of lipids and proteins. When it's intact, skin holds moisture, resists irritation, and absorbs active ingredients effectively. When it's compromised, none of that works properly.
Chlorine is an oxidizing agent designed to kill bacteria in water. The problem: it doesn't distinguish between harmful bacteria and the protective lipids in your skin. Every wash strips a little more of that barrier away.
"Chlorine strips the lipid layer of the skin — the same layer that holds moisture and keeps irritants out. Women who wash with untreated tap water are unknowingly repairing damage they caused themselves."
— Dr. Dorothee Mitterweger, DermatologistHard water compounds the problem. Limescale leaves microscopic mineral deposits on skin after washing — deposits that clog pores, disrupt natural pH, and prevent serums and moisturizers from absorbing properly.
"I've had patients who invested hundreds in hyaluronic acid and retinol," says Dr. Mitterweger. "They were applying those products on top of a layer of limescale. The actives never reached the skin."
The pattern she sees every day
The women who come to her practice are well-informed, invested in their routines — and still frustrated by the same persistent symptoms:
What actually helps — and why faucet filters are the most practical solution
There are a few approaches to reducing the impact of tap water on skin. Some people rinse with bottled or distilled water — effective, but impractical and costly long-term. Whole-house water softeners work well but require professional installation and significant upfront investment.
For most people, a dedicated faucet filter is the most practical and cost-effective solution: it attaches directly to the tap, requires no plumbing, and filters water right where it meets your skin.
tāep — a faucet filter built specifically for skincare
Among faucet filters designed for skin health, tāep has established itself as one of the most thoroughly tested options available. Developed in Switzerland and recommended by dermatologists, it was engineered specifically for daily facial cleansing — not just drinking water. Its four-layer filtration system removes over 90% of the contaminants that most affect skin health, including chlorine, limescale, heavy metals, and microplastics.
The technology has been independently tested by accredited labs. The results:
In a consumer study with 32 participants, 93.5% reported noticeably less skin dryness and 84.3% reported visibly healthier-looking skin after regular use.
"I recommend tāep to all my patients with skin concerns as a first step — before changing any products. The water is the foundation. If the foundation is wrong, nothing else can work properly."
— Dr. Dorothee Mitterweger, DermatologistBefore & after — what users notice
Customer feedback has been consistently strong. Users report noticeably less tightness and dryness after washing, reduced redness and irritation, and improved effectiveness of their existing skincare products — often within the first one to two weeks of use. The overall rating across verified platforms stands at 4.8 out of 5.
"It's been over a month and it's made such a difference with my eczema flare ups. My skin feels calmer than ever."
"My face doesn't feel tight anymore after washing… finally."
"I feel like my moisturizer is much more effective. I changed nothing else — just the water."
- ✓ Reduces chlorine by 92.8% — accredited lab tested
- ✓ Reduces microplastics by 94.3%
- ✓ 93.5% of users reported less skin dryness
- ✓ Fits most standard faucets (M22 / M24) — adapters included
- ✓ Installs in under 2 minutes — no tools, no plumber
- ✓ Lifetime warranty · 60-day money-back guarantee