FujiClean USA
Treatment that happens on the property
One tank, five chambers. The system originated in Japan in 1961 and has been refined ever since.
How the process works
In Japan the technology is called Jokaso, and FujiClean has been refining it since 1961. What FujiClean calls contact filtration sends wastewater on a circuitous route through anaerobic and aerobic chambers inside a single tank, passing over fixed-film media where bacteria digest organic matter and the media also filters the flow mechanically. Two airlift pumps, driven by air rather than motors, recirculate process water back to the first chamber and meter treated effluent out.
Sedimentation
Chamber 1 separates solids and greases from the incoming flow.
Anaerobic filtration
Chamber 2 decomposes organic matter and denitrifies nitrates on spherical filter media.
Aerobic filtration
Chamber 3 is oxygen rich, digesting solids and converting ammoniac nitrogen to nitrates.
Storage
Chamber 3A is a settling zone ahead of discharge.
Disinfection
Chamber 3B is the final zone, with an option for chlorination tablet disinfection.
Source: FujiClean USA owner's manual, residential systems.
Why designers specify it
No moving parts inside the tank
The two airlift pumps in the tank are driven by air from the external blower rather than by motors. The blower itself sits at grade, so service and replacement never require pulling equipment out of the tank.
It connects directly to the waste line
No preceding septic tank or trash tank is required, which removes a component from the design and reduces the footprint of the sanitary system.
Small and light for its capacity
Among the smaller I/A OWTS units available, which matters on constrained lots and in high groundwater, where excavation and buoyancy drive the design.
Sixty years of Jokaso
FujiClean was founded in Japan in 1961 and has developed onsite treatment technology ever since. In Japan alone it has installed more than two million systems and holds over 40% of the market.
Common questions
A few that come up most often. The full list is on the frequently asked questions page.
What happens during a power outage?
The blower stops, and after roughly 24 hours treatment quality may begin to diminish. Wastewater still passes through the system and will not back up in the house unless a separate pump station has been installed, in which case power needs to be restored to keep it flowing.
How much electricity does the system use?
Consumption is limited to the external blower and depends on the model. A CE5 or CE7 draws 1.2 kWh per day; a CE10 or CEN7 draws 1.7. Full figures for every model are in the specification table.
What happens if the alarm sounds?
Two events trigger it: high water in the tank, or a blower fault where air pressure drops. Push the toggle switch to Silence and contact your service provider. The red beacon stays lit until the controller is reset to Normal, so the alarm is not forgotten.
Is a septic tank still required ahead of the system?
Not by the system itself — it connects directly to the home's outgoing waste line. Some sites do include a settling tank ahead of treatment where local or state requirements call for one.
Drawings and approvals
Structural drawings in PDF and CAD, design manuals, blower specifications, and current Rhode Island and Massachusetts certifications.