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  6. 【SDGs】Fixed-type circular water-wash toilet Asuthia

【SDGs】Fixed-type circular water-wash toilet Asuthia

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last updated:Jan 16, 2026

COLUMBUS PROJECT Co.,Ltd. Tokyo
COLUMBUS PROJECT Co.,Ltd. Tokyo
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【SDGs】Clean flush toilets around the world! A completely self-sustaining flush toilet that doesn't require water supply, sewage, or commercial power.

The fixed-type circulating soil toilet is an environmentally friendly toilet system that utilizes the natural purification power to treat wastewater. By leveraging the activity of microorganisms living in the soil layer, it enables a stable flush toilet environment even in areas without established water supply and sewage systems. It is permanently installed in buildings and can be operated stably over long periods, making it ideal for natural parks, campgrounds, mountain facilities, and public spaces. It does not burden nature and provides users with a comfortable and clean space.

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【SDGs】Fixed-type circular water-wash toilet Asuthia

SDGsトイレ.png スクリーンショット 2025-12-07 000348.png
  • Related Link - https://asuthia-clmbs.hirameki7.site/
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◎Active during disasters with system replacement By replacing only the system while keeping existing toilets at disaster evacuation sites (parks, nurseries, schools), it becomes safe to use even during power outages, water supply interruptions, or pipe bursts. Accommodating various requests By increasing the tank capacity and the processing garden size, the processing capacity can reach 500 people per day, and we can also respond to various requests. ◎Discreet processing system Since it is a garden, planting can be done, making it visually appealing and environmentally friendly, so it does not look like a toilet processing system. ◎Power source switching is possible Normally, the existing power source is used, and during power outages, it can be switched to solar power. ◎System switching between normal and disaster situations When there is water available, such as for water supply, it can be used for toilet flushing, and it is possible to change the wastewater treatment to a soil system without circulation. Additionally, during disasters, it can be switched to a circulation system.

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Applications/Examples of results

**Introduction of Achievements** ◆ Public Toilet at Suzuran Colony Parking Lot, Fuefuki City, Yamanashi Prefecture Due to being designated as a national park and a prohibited excavation area, the installation of a septic tank was not possible. However, upon request from Fuefuki City, we installed an Astia water-flush toilet (fixed soil water-flush toilet), which is currently in operation. Over 20,000 tourists visit annually, with more than 300 people using the toilet on busy days. ◆ Public Toilet at Shimen Mountain, Hayakawa Town, Yamanashi Prefecture At the foothills of Shimen Mountain (the head temple of the Nichiren sect) in Hayakawa Town, we received a request from Hayakawa Town to install an Astia fixed soil toilet. This mountain is also designated as one of Japan's 100 famous mountains, attracting tens of thousands of climbers each year. Previously, there was a non-flush, pit toilet system that required helicopter transport for waste removal (costing about 6 million yen annually). Concerns regarding odor, hygiene, and running costs were raised. With the installation of a clean water-flush toilet, tourist numbers have increased, and the elimination of waste removal has led to cost reductions. The toilet is currently in operation.

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【SDGs✨】~ A future-type toilet that can be placed without electricity or water has been born ~ We have started handling Astia!

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◆Asuthia - Astia - Beautiful flush toilets around the world! ✨ Custom-made options are available to meet customer needs! The fixed-type circulating soil toilet is an environmentally friendly toilet system that utilizes the natural purification power to treat wastewater. By harnessing the work of microorganisms living in the soil layer, it enables a stable flush toilet environment even in areas without proper water supply and sewage systems. It is fixedly installed in buildings and can be operated stably over long periods, making it ideal for natural parks, campgrounds, mountainous facilities, and public spaces. It provides a comfortable and clean space for users without burdening nature. ◎ System replacement for disaster response By replacing only the system while keeping existing toilets in disaster evacuation sites (parks, daycare centers, schools), it ensures safe usage during power outages, water supply interruptions, or pipe bursts. ◎ Power source switching is also possible Normally, it uses the existing power supply, but it can switch to solar power during outages. ◎ System switching between normal and disaster conditions When water is available, it can be used for toilet flushing without circulation, changing only the wastewater treatment to the soil system. During disasters, it can switch to a circulating system.

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COLUMBUS

COLUMBUS PROJECT Co.,Ltd. Tokyo

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We drive business growth by providing comprehensive support for sales, marketing, and content development. Our core expertise lies in the manufacturing industry, with a strong focus on industrial and medical equipment. We also offer specialized support in sales, marketing, and digital transformation (DX) for a wide range of B2B sectors, including construction, logistics, IT/DX, trading companies, and retail. Recognizing the heightened importance of the sales function in B2B, we actively champion the digitalization of sales processes in synergy with marketing initiatives. Collaborating with a robust network of professional partners, we successfully navigate and deliver on complex projects. For any inquiries or requests, please do not hesitate to reach out.

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