Yuusui is the water purifier of your dreams

Yuusui operates on the same principle as rainwater becoming delicious spring water through natural filtration. It uses only natural stones containing mica, quartz, etc., and additive-free activated carbon, transforming water into natural water equivalent to spring water. Its remarkable capability allows for the cultivation of planarians, indicator organisms for Grade 1 water purity. Moreover, it can even sustain the breeding of chars, tropical fish, and goldfish! This is impossible with other water purifiers.
※Due to its natural antibacterial properties, antibacterial agents such as copper and silver, which are used in general water purifiers, are not added.
The raw material used is domestically sourced weathered granite, excavated from deep underground. Weathered granite contains feldspar, mica, quartz, and other minerals, with feldspar being the primary component that makes water taste good. All processing, including repeated washing, drying, and sieving with spring water, is done in-house.
The natural mineral content increases by approximately 10% in tap water, enhancing its sweetness. The ion-exchange properties of weathered natural stone continuously release minerals over a long period.
Trihalomethanes are substances formed when organic matter in tap water reacts with chlorine agents. They are suspected carcinogens. Yuusui can also remove these.
※The ability to remove trihalomethanes gradually decreases, so to maintain its removal capability, the contents need to be replaced after 5 years of use.
It removes 40% of tap water turbidity, resulting in highly transparent water. It also has the power to balance mineral content; for example, in areas like Okinawa where water has high calcium content, it removes excess calcium to produce delicious water.

The ability to remove chlorine for an extended period is due to the ion-exchange action of weathered granite, which adsorbs harmful substances and releases minerals, thereby removing chlorine.
This chlorine removal and decomposition capability recovers when the water purifier is not in use, such as overnight or when the faucet is turned off.
Removes over 90% of PFAS
Radioactive substances: Iodine-131
(Both are data from external research institutions)
PFAS are per- and polyfluoroalkyl substances. Due to their chemical structure, carbon and fluorine bonds are very strong, and they hardly decompose naturally. In 2023, the WHO's cancer research agency IARC announced that among PFAS,
▽PFOA was elevated two ranks to the highest classification of the four-tier system, "carcinogenic,"
▽And PFOS was classified for the first time as "possibly carcinogenic," the third highest classification.
It features a very simple, polished, and beautiful design. With no unnecessary bumps or recesses, water splashes can be easily wiped away. It won't rust even after many years of use. There's no need to replace the internal contents for 5 to 10 years.
The low flow rate of water purifiers can be frustrating, right? But with Yuusui, there's no need to worry. The filtration flow rate is almost the same as tap water, with a JIS standard flow rate of 9.8 liters per minute! Other cartridge-type purifiers typically deliver around 2 liters per minute, making Yuusui about 5 times faster. It is even used in restaurants.
Mineral water drawn from volcanic rock areas, such as around Mt. Fuji, typically contains very few minerals. However, the natural granite from the Abukuma Mountains used in Yuusui was originally at the bottom of the sea. It absorbed various things flowing from the land, including the remains of flora and fauna, becoming a mineral-rich rock that eventually rose to the surface from the seabed due to crustal shifts.


There are no running costs during this period. It continues to decompose and remove chlorine for over 10 years.
However, since its ability to remove harmful substances like trihalomethanes is estimated for 5 years, we recommend replacing the contents around that time.
●First 5 years after purchase
191,180 yen ÷ 5 years = 38,236 yen / 1 year (tax excluded)
●Contents replaced in the 5th year ➡ No replacement for the next 5 years
54,450 yen ÷ 5 years = 10,890 yen / 1 year (tax excluded)
●First 10 years after purchase
191,180 yen ÷ 10 years = 19,118 yen / 1 year (tax excluded)
●Contents replaced in the 10th year ➡ No replacement for the next 10 years
54,450 yen ÷ 10 years = 5,445 yen / 1 year (tax excluded)
※We provide chlorine testing reagents free of charge at any time, so please use them for checks when replacing contents.100% removal of radioactive substances through ion-exchange action of weathered granite
A water purifier using only natural stone and additive-free activated carbon,
Natural Water Purifier Yuusui
For household and commercial use, it can be used for drinking, washing vegetables,
cooking rice, boiling, and all foods consumed.
It produces natural water of the same quality as spring water, capable of raising goldfish, tropical fish, and planarians, which can only live in spring water.
Main Unit
Stainless steel, pressure resistant to 20kg (no special faucet required)
Main Unit (Height: 36cm, Diameter: 12cm, Weight: 6kg)
Content Replacement
¥54,450 (tax excluded)
Installation and removal fees are separate














