Natural filtration spring water purifier

Water Purifier that Can Remove PFAS

What is PFAS?
PFAS is a collective term for per- and polyfluoroalkyl substances, comprising over 10,000 different compounds. They are known as "forever chemicals" because they barely decompose in nature.
In the 2023 carcinogenicity evaluation by the International Agency for Research on Cancer (IARC), an agency under the World Health Organization, PFOA, which has been used in stain repellents for clothing and in frying pans, was classified as Group 1 (carcinogenic to humans). PFOS, which has been used in semiconductors, was classified as Group 2B (possibly carcinogenic to humans).
Beyond cancer, the U.S. National Academies of Sciences, Engineering, and Medicine have also pointed out concerns based on concrete evidence, such as increased cholesterol levels, thyroid hormone abnormalities, and effects on fetuses.
These substances have diverse applications and have been detected in water across Japan. Numerous reports also indicate high levels of PFAS in the blood of residents who drank the water, posing health risks.

>> Domestic Detection Status of PFOS and PFOA - Ministry of the Environment (2023)

Test conducted by: Japan Food Research Laboratories
Specimen: Yusui Water Purifier
No. 23062766001-0101

PFOS and PFOA Filtration Performance Test Results

<Test Result Annotations>

*1 Limit of Quantitation: 0.000005 mg/L
*2 Limit of Quantitation: 0.0000025 mg/L

<Test Conditions (Partial Excerpt)>

Water: Tap water (Tama City, Tokyo)
Measurement Method: Solid Phase Extraction-Liquid Chromatography-Mass Spectrometry

Recreating the filtration method of a serene forest, we use only domestic weathered granite dug deep from the earth and additive-free activated charcoal, without any scientific additives. Tap water is transformed into safe, clear, and sweet-tasting spring water, protecting your family's health.

It instantly removes harmful substances (chlorine, PFAS, trihalomethanes, etc.) while performing cation exchange, releasing minerals from the granite. This is the same principle of natural purification as rainwater filtering through bedrock to become spring water.
If only chlorine removal is desired, it can continue to remove chlorine for over 10 years.

There are no restrictions on the amount of water used, and because of the large water volume, it is used even in professional settings such as restaurants. You can wash dishes and clean with dechlorinated purified water.
⇒Watch a video on YouTube showing the water volume.

This is an internal content replacement system that does not require maintenance such as monthly cartridge replacement. Normally, "water pressure cleaning maintenance," which cleans the inside of the water purifier with tap water, is sufficient. This is maintenance that anyone can easily do themselves.

This system removes 40% of tap water turbidity, producing highly transparent water suitable for breeding Class 1 water quality organisms such as yamame trout and planarians, which can only inhabit the clearest waters.

Water that has passed through granite is said to be delicious. The granite used in Yusu has been on the seabed since ancient times, but it later uplifted to the surface and was exposed to wind and rain for many years, becoming a stone full of invisible holes, and is also a natural, intricate filter containing minerals. The mineral content is about twice that of Suntory's "Alps no Ten'nensui" (Natural Mineral Water from the Southern Alps).

Chlorine and Water Purification

Did you know that there's no upper limit on chlorine levels in Japan's tap water? What happens when you ingest chlorine? Are cartridge-type water purifiers dangerous? Learn about the environment surrounding tap water.

Yusui: The Water Purifier of Dreams

Natural filtration without chemical substances. Water flow is almost the same as tap water. You can also keep planarians, char, and goldfish. This is a dream water purifier that no other water purifier can achieve.

Installation and Maintenance

Running costs: 0 yen. Easy to install for anyone, even women, with the stationary type. Simply replace the internal components every 5–10 years. Easy maintenance. Can be used for commercial purposes! Free one-week rental available.

Frequently Asked Questions

We have compiled a list of frequently asked questions about the Yusui water purifier, such as "Is water from the Yusui water purifier safe for babies to drink?"

Natural Water Purifier YUSUI Water Purifier [Countertop Model]

Free shipping free cash on delivery

First-time customers only / Limited to one item per person / Cash on delivery not available

The YusuいのSuito-gata water purifier uses only natural stones and additive-free activated carbon. It can even be installed by women.

■Body: Height/36cm Diameter/12cm Weight/6kg
■Stainless steel Pressure resistance 15Kg
■Made in Japan

¥210,298 (税込)

Natural Water Purifier YUSUI [Undersink Type]

Free shipping free cash on delivery (COD)

First-time customers only / One per customer / Not available for cash on delivery

The Yusuu Natural Water Purifier under-sink model uses only natural stones and additive-free activated carbon. It keeps your kitchen area neat and tidy.
Please contact a professional for installation.

■Unit: Height/36cm Diameter/12cm Weight/6kg
■Stainless steel, pressure resistant to 15kg
■Made in Japan

¥210,298 (税込)

Yuusui Water Purifier Cartridge Replacement

Free shipping no handling fee

First-time customers only / Limited to one item per person / No cash on delivery

It takes about one week to replace the contents of the Yusui water purifier. During this time, we offer a free loaner unit.
Please do not hesitate to ask for one.
For details on how to replace the contents, including how to remove and send the Yusui, please refer to the Installation/Maintenance page.
*Customers are responsible for the shipping costs when the water purifier is sent and when the loaner unit is returned.

¥59,895 (税込)

Natural filtration spring water purifier

Water Purifier that Can Remove PFAS