Hello Klean Filtration
Science & Testing
Filtration Ethos
Our priority is to ensure filtration performance remains high during the entire filter life. That’s why we always test our filtration across the filter’s lifespan. Our research shows estimated water consumption for a household of two for a bathroom faucet is 760L for 2 months. We tested our filtration across 2000 litres of water.
Skin Filter Filtration Test Results
Skin Filter Filtration Test:
To understand how performance changes over time, the Skin Filter cartridge was tested at increasing water volumes under two different chlorine concentrations.
Each cartridge underwent a full-process challenge test. At scheduled points, the chlorine concentration was measured before and after filtration, and the difference was used to calculate the removal rate. Testing was conducted at approximately 2 litres per minute to represent water moving through the filter during use.
Free chlorine reduction (%)
Test 1
The Lab:
Laboratory performance testing was conducted by SGS, one of the world’s leading independent testing, inspection and certification companies.
One Skin Filter cartridge was evaluated in each test. Results relate to the samples tested and may vary depending on water quality, temperature, flow rate and usage.
Chlorine is added to water supplies as a disinfectant to kill bacteria, viruses, and other harmful microorganisms. The World Health Organization notes that on average, chlorine is present in most disinfected drinking-water at concentrations of 0.2–1 mg/litre (3). The Environmental Protection Agency’s (EPA) maximum allowable limit of 4 ppm for drinking water.
To understand how performance changes over time, the Skin Filter cartridge was tested at increasing water volumes under controlled scale-forming conditions.
One cartridge was run with tap water across 2,000 litres. At 0, 400, 1,200 and 2,000 litres, a controlled challenge solution prepared with magnesium sulfate, calcium chloride, sodium bicarbonate and sodium chloride was passed through the cartridge at approximately 2 litres per minute. At each point, 500 ml samples were collected before and after filtration. The samples were boiled at 100°C for 30 minutes, cooled and filtered before their remaining hardness was measured. This established how much of the hardness had stayed dispersed in the water instead of precipitating as solid scale.
Scale inhibition (%)
Test 1 — Measured Scale Inhibition
Test 1 — Measured scale inhibition: The filter achieved 92.51% scale inhibition when new. This measured 65% at 400 litres and 62.5% at both 1,200 and 2,000 litres, demonstrating continued scale-inhibiting activity at the final measurement point.
Test 2 — Visible scale formation: In a separate visual boil test, the unfiltered challenge water produced significant scale across the surface and bottom of the container. No scale was observed in the filtered sample when the cartridge was new. Some surface scale was observed in the filtered samples at 400, 1,200 and 2,000 litres.
The Lab:
Tested at our partner’s laboratory.
One Skin Filter cartridge was evaluated. Results relate to the sample tested and may vary depending on water composition, temperature, flow rate and usage.
Scale inhibition reduces the tendency of hardness minerals to form solid deposits; it does not remove calcium and magnesium from the water or soften it. Therefore water measured with a TDS meter (which measures the electrical conductivity of water to estimate overall mineral content in parts per million (ppm)) will show no changes to water hardness from the tap because our technology encapsulates minerals rather than removes them.
Hard water contains elevated levels of dissolved minerals, primarily calcium and magnesium. When hard water is heated—or water evaporates—these minerals can precipitate and form solid deposits known as limescale. Scale inhibition helps keep more of these minerals dispersed in the water, making them less likely to form deposits on hair and skin.
To understand how performance changes over time, the Skin Filter cartridge was tested at increasing water volumes under a deliberately elevated lead concentration.
One cartridge underwent a full-process, lead-spiked water challenge across 1,000 litres. Water containing 150 ± 30 μg/L of lead was passed through the cartridge at 3 litres per minute throughout the lifespan test. At 0, 250, 500, 750 and 1,000 litres, the lead concentration was measured before and after filtration at approximately 2 litres per minute, and the difference was used to calculate the reduction rate.
Lead reduction (%)
Test 1 — Elevated Lead Spiked Challenge
The filter reduced lead by 98.58% when new, lowering the measured concentration from 127.54 μg/L to 1.81 μg/L. Reduction remained above 95% at every measured point through 500 litres, with 95.05% reduction recorded at 500 litres. This decreased to 86.96% at 750 litres and 54.59% at 1,000 litres.
The Lab:
Tested at our partner’s laboratory.
One Skin Filter cartridge was evaluated. Results relate to the sample tested and may vary depending on water quality, temperature, flow rate and usage. The lead concentration used was a controlled challenge condition and should not be interpreted as representative of typical tap water. Skin Filter is designed for bathroom use and is not a drinking-water purification device.
Lead is a recognised benchmark for heavy-metal filtration, and the strong lead result demonstrates the cartridge’s ability to capture lead effectively. The filtration media is also designed to target a wider range of heavy-metal ions, although performance varies by metal and water conditions.
The Environmental Protection Agency’s health-based goal for lead in drinking water is zero. Lead is not intentionally added to water. It can enter at the tap when lead-containing pipes, faucets or other plumbing materials corrode. The World Health Organization maintains a provisional guideline value of 10 μg/L for drinking water and recommends keeping concentrations as low as reasonably practical.
Customer Research Tip
Look beyond the headline number. A headline reduction rate may only reflect how a filter performs when it is new. To understand its lasting performance, look for results from across the cartridge’s lifespan—including the final test point. That’s why we test at multiple stages and share both the initial and final results: how a filter holds up matters just as much as how it begins.