Your drawing barely changes
As a Category 1 technology, drain field sizing, loading rates and the configuration of every component following the tank are exactly what you already draw.
Category 1sizing and loading rates unchanged
Fuji Clean distributionRhode Island and Southeast Massachusetts
The whole treatment train. One tank.
David Dow is the exclusive distributor for the territory. One vessel replaces the train, and everything downstream of it stays exactly as you already draw it.
33 sq ftThe whole excavationA CEN5 at 8′0″ × 4′1″, 463 pounds. No septic tank ahead of it.
RIDEMCategory 1 technology
NSF 40/245Certified nitrogen removal
2M+ in the groundAerating worldwide, right now
Section through a siteAbove grade, photographed. Below grade, drawn.Not to scale
RIDEM Category 1 technology
Four reasons it keeps landing on the plan.
Not a new way to design a septic system. The same design, with the treatment train replaced by a single vessel that fits where nothing else would.
One hole, one tank, one airline
Contractors call it the easiest single-tank system to put in the ground. Units arrive plug-and-play with no onsite assembly, and take Tuf-Tite or Polylok risers.
No assemblyplug-and-play on delivery
Built for the lot that will not take one
A CEN5 goes down narrow access on a mini excavator, between mature plantings and around the features that rule out a conventional train.
463 lba CEN5 at 8′0″ × 4′1″
A backflush, twice a year
Three dials and a solids backwash: twenty to thirty minutes, no component removal, no hose-down. Denitrification is a dial setting, and there are no timers.
20–30 mina visit, twice a year
The same section, both ways
Try the substitution yourself.
Swap the conventional train for a Fuji Clean tank and watch the right-hand half of the drawing stay exactly where it is. That is the whole proposition, so it is worth doing with your own hands rather than reading about.
- Tanks in the excavation
- Two or more
- Preceding septic tank
- Required
- Footprint
- Sum of the vessels
- Dry weight
- Concrete, set by crane
- Power draw
- Varies by unit
- Certification
- Varies by unit
- Drain field sizing and loading rates
- Unchanged
- Pump basin size and float arrangement
- Unchanged
No moving parts below ground
Four zones, in one pass.
Contact filtration with flow equalisation, continuous recirculation and controlled discharge, across more than 3,500 field samples worldwide and third-party NSF testing in the United States.
Flow through the vesselInfluent enters at the left, treated effluent leaves at the right
Sedimentation
Solids settle out and are stored in the tank.
2–3 yearsbetween pump-outs
Anaerobic filter
Fixed-film breakdown across the media bed.
No powernothing driving it
Aerobic contact media
Air through the media, set on a dial.
1.2 kWha day, on a CEN5
Clarification
Return flow, then controlled discharge.
~95%BOD and TSS removed
RIDEM approved, 500 to 1,000 gpd
The residential lineup, on one page.
The CEN models are the ones named on the Rhode Island approval, certified to NSF/ANSI 40/245. The CE range treats to NSF/ANSI 40 where nitrogen removal is not required. Commercial units run to 6,000 gpd. Ask.
| Model | Rated flow | Footprint | Dry weight | Power | Blower | Certification | RIDEM | Typical use |
|---|---|---|---|---|---|---|---|---|
| CEN5 | 500 gpd | 8′0″ × 4′1″ | 463 lb | 1.2 kWh/day | FujiMAC 80RII | NSF/ANSI 40/245 | Category 1 | 3–4 bedrooms |
| CEN7 | 700 gpd | 8′3″ × 4′9″ | 705 lb | 1.2 kWh/day | FujiMAC 80RII | NSF/ANSI 40/245 | Category 1 | 4–6 bedrooms |
| CEN10 | 1,000 gpd | 9′11″ × 5′9″ | 926 lb | 1.7 kWh/day | FujiMAC 100RII | NSF/ANSI 40/245 | Category 1 | 6–8 bedrooms |
| CE5 | 500 gpd | 7′1″ × 3′8″ | 397 lb | 1.2 kWh/day | FujiMAC 80RII | NSF/ANSI 40 | not listed | 3–4 bedrooms |
| CE7 | 700 gpd | 8′0″ × 4′2″ | 463 lb | 1.2 kWh/day | FujiMAC 80RII | NSF/ANSI 40 | not listed | 4–5 bedrooms |
| CE10 | 1,000 gpd | 8′3″ × 4′9″ | 705 lb | 1.7 kWh/day | FujiMAC 100RII | NSF/ANSI 40 | not listed | 6–8 bedrooms |
Residential range, one scale
Plan, residential rangeDrawn at one scale, covers where they fall
Where the ground drains to something that matters.
Rhode Island and the Massachusetts south coast are increasingly nitrogen-restricted, and for good reason: wastewater-derived nitrogen reaches drinking water and feeds the algal blooms that wreck a bay. CEN models are built for exactly that ground.
11.0 mg/L
Total nitrogen returned across twelve Maryland field sites.
<19 mg/L
Total nitrogen, the Category 1 standard the CEN range is approved against.
Fuji Clean Co., Ltd., since the 1970s
Not a new technology. A very well-proven one.
Fifty years of manufacture, more than fifty staff engineers on testing and product improvement, and the CE and CEN series as the most successful lines they build.
2,000,000+
Residential systems installed and operating worldwide.
50,000
Commercial systems in the ground.
50 years
Of manufacture, with more than fifty staff engineers on testing.
39 dB
Blower noise above grade, up to a hundred feet from the tank.