Our FAQs are divided into two categories: Professionals and Homeowners.

FAQs for Professionals

A number of ways.  The Fuji Clean distributor in your area should be able to give you drawings and design details especially as they apply to local regulations.  You may also contact us directly at info@fujicleanusa.com, call us: 207-406-2927 or find them on our website on the Technical tab.

No.  Both airlift pumps use pressurized air (from the blower) to carry water via ascending bubble fluid pressure.  The discharge airlift pump lifts treated effluent from the treatment tank but depends on gravity to carry it to a subsurface disposal system.  You must specify a separate discharge pump for pumping effluent if a head is necessary.

Currently, Fuji Clean offers a separate pump station constructed to our specifications. In the near future, we will offer a built-in pump station chamber which can accomodate pumps of various sizes. Please contact us for more information.

Fuji Clean standard hydraulic sizing assumes domestic strength influent (i.e. about 250 mg/L BOD and 150 mg/L TSS).  Models to treat higher strength waste streams are upsized linearly based on organic loading strength.

For example, the standard Fuji Clean system Model CE5 (the smallest residential unit), can treat about 1 pound of BOD per day to NSF 40 standards (calculation: Assuming a 450-gpd hydraulic flow, an organic strength of 250 mg/L  BOD, then 8.34 x 250 x (450/1,000,000)= 0.94 pounds of BOD per day).  Therefore, if a system with similar hydraulic loading is accepting wastewater with an organic load of 500 mg/L BOD, then Fuji Clean would specify a CE10 system which is capable of double the hydraulic loading of a CE5.

Please feel free to contact your Fuji Clean distributor or Fuji Clean USA directly for system sizing assistance.

During standard operation, flows fluctuate between high and low level bands.  Capacity above high water may vary depending on riser height, but is as follows assuming no riser capacity and no pump station:








Storage Capacity above HWL (Gal)







Storage Capacity above HWL (Gal) with one  12” risers













Storage Capacity above HWL (Gal) with two  12” risers













Yes.  Air blower operation is independent of hydraulic flow.  Please refer to the Blower Table on our Technical tab for power consumption.

Yes.  Decibel levels are provided in the table below.   In general, noise from the MACBlower “R” series line places Fuji Clean blowers as best-in-class category.   (Please refer to the Fuji Clean O&M Manual for blower sizing information.) Most Fuji Clean residential units use a MAC80R air blower.  

MACBlower Model

Operating Decibels


 40 dB


  42 dB 


 40 dB


 42 dB


 41 dB


44 dB


45 dB

The following table provides empty tank buoyancy information for Fuji Clean residential system models.  As stated in the Fuji Clean Installation Manual, for high groundwater sites we recommend anchoring the tank using precast concrete anchors (deadman) and 1 inch galvanized coated strapping or equivalent.  Set deadman 12” away from tank.   Please do not use lifting lugs with turnbuckles to anchor tank, as special fittings are required for this. Please contact Fuji Clean USA for additional details.   

Empty Tank Buoyancy:

Model CE5:  5,270 Lbs.

Model CE7:  7,210 Lbs.

Model CE10:  10,400 Lbs.              

Model CEN5:  7,210 Lbs.               

Model CEN7:  10,400 Lbs.             

Model CEN10:  14,500 Lbs.

Since there is a national law in Japan that requires annual pumping of all onsite systems, our best long term sludge accumulation data comes from Australia where it was determined that average time to reach pumpout depth is every 4 years.  (Please refer to page 3 of the Technical Summary).  Fuji Clean USA requires that sludge be measured at each 6 month service visit. As directed in the Fuji Clean O&M Manual, system pumpout should occur when sludge levels reach 24” in the sedimentation chamber (first chamber) or 18” in the anaerobic chamber (middle chamber). Based on “normal” full time household water use, we therefore recommend pumpout once every 2 years with higher frequency for higher hydraulic or organic strength flows – particularly if a garbage disposal is being used.

Fuji Clean USA currently offers two standard residential control panels, one basic (“A”) and one upgraded (“B”).  Control panel “B” is equipped with auxiliary alarm contacts that can be connected to a separate auto dialer with an active phone line for providing remote notification of alarm conditions with customized controls. The panel also includes an event counter that tracks alarm events.

All Fuji Clean systems come equipped with a chlorination dispenser engineered to meter chlorine into the disinfection chamber of each unit.  Recognizing that chlorine is not allowed in many states, Fuji Clean’s NSF/ANSI 40 & 245 testing configuration included a post treatment Salcor Model 3G disinfection unit.  Fecal data from this testing will be available soon. The CEN5 system with the Salcor 3G disinfection unit meets Washington State standards.  An NSF fecal report is available upon request.  Please contact Fuji Clean USA for additional information.

Assuming a recommended start-up configuration (2/3 clean water, 1/3 septic), Fuji Clean systems achieve NSF 40 standards within 1 week of operation, understanding that there are many variables that contribute to start-up performance.

The Fuji Clean system is designed to accommodate variable flows, in large part due to the recirculation airlift pump which has a built in mechanism for leveling variable flows to maximize retention time and treatment.  For extreme variable flows (such as in a church where there is a very large peak flow one day a week), we recommend the installation of a preceding settling tank large enough to accommodate total peak flow and then metering flow to the system throughout the unused periods.

Yes. As noted in the Fuji Clean Installation Manual, we recommend insulating the upper half of the system tank, discharge pump (if applicable), discharge line and D-box for all installations in cold climate environments.  Recommended insulation is 2 inch rigid foam board (R-10 insulating factor) covering the system and about 6” over discharge lines to stop frost penetration into the ground.

Fuji Clean recommends that this “cold climate” procedure be followed within the USDA  Zones 3-6.  A sample map and further information about these zones can be obtained at: www.usna.usda.gov/Hardzone/ushzmap.html.

Our largest single system is the Fuji Clean PCN100 unit.  It is capable of treating 5,283-gpd.  Please refer to our commercial system page for more information.

Yes.  Please contact Fuji Clean USA for additional details and engineering assistance if necessary.

Yes, please refer to page 3 of the technical study for a summary technical explanation of how P removal is accomplished with Fuji Clean CEX and CRX systems.  For more details, please contact Fuji Clean USA directly.

Fuji Clean has successfully completed NSF/ANSI 40 and NSF/ANSI 40 & 245 testing.  A summary of results is available in our technical specifications.  Please contact Fuji Clean USA directly for detailed information.

Discharges from water treatment systems, such as water softeners or water filtration systems that require back flushing, are not considered wastewater and should not be pumped into a septic system.  Instead, divert this flow into a separate, properly constructed dry well if possible (refer to state and local codes).

Yes.  Our CEN model line (tested for NSF/ANSI 40 & 245) will provide single digit BOD and TSS results (as well as highest quality TN removal) with domestic strength wastewater as demonstrated in NSF testing.  A summary of NSF testing results is available in our technical specifications.  Please contact Fuji Clean USA for details.

FAQs for Homeowners

Typically local regulations and soil conditions of your unique home site may dictate the need for a treatment (sometimes called “pretreatment”) system.  Your Fuji Clean treatment system accepts wastewater from your home, cleans it and sends clean water back to the environment (usually into a soil absorption system such as a leach field).  The advantage of this process is that our systems do the purification work ordinarily accomplished by the soil, and therefore this allows smaller, shallower and less obtrusive drain fields.  Additionally, pretreatment greatly extends the life of a drain field since clean water deters solids and biological buildup (biomat) in your soil absorption system.  Also, in some regions, treatment is required to reduce nutrients such as nitrogen or phosphorus from your waste stream as protection against contamination of water bodies.

Fuji Clean systems are designed to accommodate variable and intermittent flows, including only weekend use, although the air blower operates continuously regardless of inflow.  However, for seasonal use properties, the air blower may be shut down if the system is not going to be used for an extended period of time.  The blower should be re-started at least three days in advance of system use if possible.  

During a power outage, the blower will cease operation and after about twenty-four hours treatment quality will diminish.  However, the Fuji Clean system will still allow wastewater to pass through and will not create a backup in the house unless a separate pump station has been installed.

Your Fuji Clean system is designed to require minimal service, although a schedule of regular inspection and service is necessary. Inspection and service every six months is necessary during the first two years of use to assure proper operation.  States vary in terms of service requirements after the initial two year warranty expires, but Fuji Clean USA’s extended service policy mandates semi-annual inspection or service visits from a trained and certified provider.  (This schedule may be altered for seasonal and part-time use).  Your certified service provider will review details of our initial (first two years) and extended (two years +) service plans.

Like an ordinary septic tank, sludge must be removed from your system periodically (such as once every two - four years).  Your service provider should provide guidance for you on this and if necessary will help to arrange for a septic tank pumping company to provide this service.  Pump-out frequency depends on waste stream strength and use; please consult with your service provider to help determine the frequency that is best for you.  Also, please note:  use of a garbage disposal may increase pump-out frequency.

Since your Fuji Clean USA system has been designed to operate continuously, it is easy to calculate power cost.  All residential units draw 1.3 kWh of power per day except the CEN10, which draws 1.9 kWh of power per day.  Simply multiply your local cost of power by the draw per day to calculate daily power cost.

Fuji Clean treatment systems will accommodate waste flow from garbage disposals.  Due to the increased organic load you may have to pump the sludge from your system on a more frequent basis; your service provider should be aware that a garbage disposal is in use and will help you determine the proper pump-out frequency.

Your Fuji Clean system is dependent on live bacterial microorganisms to clean wastewater.  It is a living culture!  Therefore, it is in your best interest to avoid the heavy use of bleach as much as possible.  If you must use bleach, use it sparingly and spread out its use over time.  

Since your treatment system is a living culture, you should avoid flushing or draining toxic materials into the system such as paint, household chemicals and antibiotic medicines as they can harm the natural bacterial action that is present.  Other items to avoid flushing into the system include bulky or non-biodegradable materials in general such as sanitary napkins, paper towels and cigarette butts.   Coffee grounds and excessive cooking grease are not helpful to efficient system processing and should be disposed of through your compost/recycle/solid waste stream instead of though your treatment system.

On occasion, a contaminated well needs to be disinfected (usually with Clorox bleach).  If you need to do this, do not run the chlorinated water through your septic system.  Instead, open the outside water faucets and let the water run for several hours or as long as necessary to flush the chlorine out of the well.  Meanwhile, avoid using water inside the house.

No!  Toilet tablets and drain-clean products will generally deplete necessary bacteria from the system.  Products that advertise drain field health are typically unhelpful to the system and often temporarily emulsify fats, oils and greases, only to re-coagulate after they reach the drain field.

Absolutely.  Be sure that plumbing fixtures such as toilet bowl fill valves and faucets are maintained and do not leak.  You would be amazed at how much water passes through the system with a small leak or dripping faucet.  Your system is sized to meet standard flows from your house and therefore any excess flows will not help water treatment. Remember that maintenance of these fixtures also conserves your water.

Your alarm/control panel monitors all important functions of your Fuji Clean system and an alarm (both audio and visual) will be triggered in the rare event of a problem, such as water is not being discharged from the system or your air blower is not operating properly.    In the event of an alarm condition, go to the alarm panel, find the toggle switch on the outside right and push toward “silence.”  This will mute the audio alarm, although the visual alarm light will remain lit.  Next, contact your service representative for assistance. The contact information for your service representative should be affixed to your alarm panel.

As a general rule, the more natural the cleaning product the better.  Synthetic surfactants designed for toilet bowls for example, often contain chemicals, synthetic dyes, chlorine bleach, ammonia, petroleum-derived ingredients, and other harmful ingredients, such as Triclosan (prevents mold growth) that are incompatible and hazardous to a healthy bacterial eco-system living within your Fuji Clean system.  Ideal choices might include white vinegar, Borax, or other citric acid based cleaners.

Studies of the Fuji Clean system with flows as low as 10% capacity showed little change in treatment performance.  Even after 6 months of no flow, research indicated that microbes survived in a dormant state and treatment rebounded immediately when flow was reintroduced.