Qualify access
Preserve ordinary pumping, required inspection and independent removal paths in the actual host tank.
Subfield / Retrofit systems
Subfield Retrofit
Concept schematic
Retrofit process concept
Explanatory retrofit schematic—not to scale, manufacturing geometry or proof of treatment. Existing tank and access must qualify.
In developmentCatalog family · engineered-septic-system
A modular wastewater-treatment retrofit being developed for suitable existing septic tanks. Original Subfield assemblies, clear connections and service access—without another wastewater vessel in the base design.
A coordinated retrofit platform, not a tank purchase. Qualification begins with the existing tank’s condition, geometry, usable volumes, access and approved downstream system. Treatment, mounting, circulation, clarification and protection must work as one reviewed configuration.
Design priorities.
- Existing shell retained; no additional wastewater vessel in the base concept
- Modular airlift-driven fixed-film development baseline
- Protected solids separation and preserved pump-out access
- Original Subfield assemblies with purchased pumps
Where it belongs
Inside a qualified existing septic tank, with appropriate dry exterior equipment and the approved disposal interface.
Research is not a released product.
Earlier component and tank studies remain available with their original context. No image transfers treatment, fit or manufacturing qualification to this retrofit.
Browse the research archive01 / Product information
Know what you’re selecting.
A coordinated retrofit platform, not a tank purchase. Qualification begins with the existing tank’s condition, geometry, usable volumes, access and approved downstream system. Treatment, mounting, circulation, clarification and protection must work as one reviewed configuration.
- Product family
- Subfield Retrofit
- System collection
- Retrofit systems
- Intended location
- Inside a qualified existing septic tank, with appropriate dry exterior equipment and the approved disposal interface.
- Exact dimensions & ratings
- Pending qualified product release
- Orderable variants
- Not released; this preview selects no configuration
- Manuals & warranty
- Configuration-specific documents and reviewed terms pending
02 / Compatibility
Qualify the tank and the whole site.
Review tank integrity, usable volumes, baffles, access, ventilation and the approved disposal system together. Nominal tank gallons do not establish treatment capacity.
- 01
Host-tank structure, usable volumes and module extraction
Confirm against the released documentation and approved installation record before use.
- 02
Actual influent loading and demonstrated effluent performance
Confirm against the released documentation and approved installation record before use.
- 03
Ventilation, utilities, protection and approved disposal
Confirm against the released documentation and approved installation record before use.
Adding this family to an inquiry does not establish compatibility.
03 / Service approach
Plan the next service call.
Plan professional access, normal pumping, required inspections and component-specific care from the beginning. A three-to-five-year hardware-service goal is not a published care schedule or permission to omit required visits.
Keep the record
Retain host measurements, approved configuration, installed revisions, commissioning and service contacts.
Follow the care plan
Use the released configuration-specific schedule. Pumping, mandated visits and purchased-pump obligations remain separate from hardware-life goals.
04 / Before you order
A few useful answers.
The final selection needs qualified specifications, configuration-specific instructions and the approved site design.
Does it fit every septic tank?
No. The objective is broad coverage through a qualified range of host tanks and adapters. Condition, geometry, access, usable treatment and solids-storage volume, ventilation and the downstream field must all be reviewed.
Does the base design need another buried tank?
No additional wastewater tank or pod is part of the base retrofit concept. Suitable dry equipment housing and existing approved dosing infrastructure may still be needed. A site that cannot meet the configuration requirements may not qualify.
Is this just a filter?
No. The proposed core is an aerobic biological process supported by fixed media, with controlled circulation and protected solids separation. Required coarse protection or field filtration performs a different job.
Is it rated for 600 gallons a day?
Not yet. Approximately 600 US gallons per day is an initial development duty. A rating requires testing of the complete configuration at defined wastewater loads and operating conditions.
Will it be maintenance-free?
No. The goal is to reduce avoidable intervention and develop hardware servicing around normal pump-out where evidence and approval permit. Pumping, required inspections, wear components and purchased-pump care remain; a three-to-five-year interval is not established.
Do you manufacture the pumps?
No. Pumps are the explicit purchased exception to our original-assembly manufacturing plan. The air-pump or blower production arrangement remains under evaluation.
Can I order or install it today?
Not yet. This is a development preview. Released configurations, qualified instructions, local approval, commercial terms and availability must be established first. An inquiry is not a purchase, reservation or compatibility decision.
Does it still work without internet?
Essential treatment and required local alarms are being designed not to depend on cloud access or a subscription. A power outage is different and must follow the qualified, finite-reserve failure plan.
Related functions—not a verified bundle or permission to substitute parts.
Pumps & treatment
Treatment media cassette
Original removable fixed-film media sections, qualified with oxygen delivery and protected clarification.
Tank & service
Wet service carrier
Original host-specific adapters, support backbone and independently retrievable working modules.
Controllers
Subfield Core
Exterior supervision, local service and upstream power isolation for the retrofit.
Pumps & treatment
Sampling assembly
Accessible sampling of the defined effluent stream for actual laboratory evidence.