NSF/ANSI 40 and 245 Certified Residential Wastewater Treatment System

IMET’s advanced residential treatment systems use Engineered Bioactive Porous Media™ Technology to sustain dense, diverse aerobic microbial populations to efficiently remove BOD, TSS, and Total Nitrogen. Because the biology is primarily retained within the media, the system is resistant to biomass washout during hydraulic or chemical shock and can remain stable through periods of low organic loading.

The system successfully completed testing to NSF/ANSI Standards 40 and 245, achieving 91.8% average CBOD₅ reduction, 94.9% TSS reduction, and greater than 50% Total Nitrogen reduction, with an average effluent quality of 16 mg/L CBOD₅.

IMET Residential Treatment Systems

System Capacity & Biological Treatment

Engineered Bioactive Porous Media™  •  Aerobic biological treatment
Comparison of IMET 600.S, 900.S, 1200.S and 1500.S wastewater treatment systems by flow, media surface area and CBOD5 removal capacity.
System Maximum
Daily Flow 		Total Media
Surface Area 		Residential
CBOD5 Reduction 		Estimated High-Strength
CBOD5 Removal1
600.S 600 GPD 13,645 ft² 0.99 lb/day 1.78 lb/day at 300–400 mg/L influent
900.S 900 GPD 22,510 ft² 1.64 lb/day 3.09 lb/day at 300–400 mg/L influent
1200.S 1,200 GPD 33,752 ft² 2.46 lb/day 4.63 lb/day at 300–400 mg/L influent
1500.S 1,500 GPD 45,002 ft² 3.28 lb/day 6.17 lb/day at 300–400 mg/L influent

1. *Estimate is scaled according to reactor surface area: 300–400 mg/L at ~500 gpd showed 1.37 lbs/day of CBOD5 reduced (avg. Influent 335 mg/L, avg. Effluent 20.9 mg/L) during the Acclimation Period and the 6 months of NSF/ANSI 40/245 testing for 7 total days during June, July, August and September. Estimates should be considered preliminary system-sizing guidance and confirmed for project-specific wastewater characteristics, hydraulic loading, and regulatory requirements.

Have a project in mind? Contact IMET to discuss system design, pricing, or project-specific applications.

91.8% CBOD₅

Avg. Influent 192.4 mg/L → Avg. Effluent 15.8 mg/L

94.9% TSS

Avg. Influent 168.9 mg/L → Avg. Effluent 8.6 mg/L

>50% TN reduced

IMET’s EBPM™ platform supports configurable biological nitrogen removal.

The NSF/ANSI 245 test configuration achieved 51.3% Total Nitrogen reduction. Additional nitrification and denitrification capacity achievable through system design, hydraulic retention, and recirculation.

Engineered Bioactive Porous Media™ Technology

The IMET® Engineered Bioactive Porous Media™ (EBPM™) wastewater treatment technology is engineered to cultivate, sustain, and protect extremely large and diverse aerobic bacterial communities within its three-dimensional structure.

IMET wastewater treatment module

High population of colonies of aerobic bacteria within the module

Large porous solid surface area houses extremely large population of highly diverse bacteria

  • 3,000 – 90,000 sq ft / cu ft – Inorganic and Synthetic media
  • Varied Physicochemical Properties

Negligible to no bio-sludge production

Bacterial populations develop and complete their lifecycle within the pore structures

  • Decomposed dead bacteria are consumed within the pores of the media

Aerobic environment, with dissolved oxygen (DO) levels ≥ 3 ppm at all times

Increased holdup time of air bubbles within the waterbody

  • Proprietary design enables the packed porous media to become saturated with entrapped air bubbles

Discover the full potential of IMET® EBPM™ Technology

  • Wastewater Treatment Plants

    IMET® Treatment Module (ITM)

    • Meets discharge requirements at all times

    • Minimal to no H₂S odor

    • Minimal to negligible bio sludge production

    • Space-efficient, modular treatment

    • Resistant to toxic shock

    • Reduced retention times

    • Small footprint

    • For new or existing wastewater treatment plants

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  • Residential Septic Remediation

    IMET® Remediation Module (IRM)

    • Meets discharge requirements at all times

    • Minimizes pumping requirements

    • Eliminates bad odor (H₂S) to negligible levels

    • Remediates existing failing septic system

    • Recovers leach field

    • Potential reuse of treated water

    • Significant reduction of fecal coliform

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  • Grease Interceptors / Traps

    IMET® Grease Module (IGM)

    • Eliminates bad odor (H₂S) to negligible levels

    • Minimizes or eliminates jetting and pumping

    • Accelerates the biological degradation of FOG

    • Eliminates build-up of FOG in downstream lines and lift station

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  • Lift Stations

    IMET® Grease Module (IGM)

    • Eliminates bad odor (H₂S) to negligible levels

    • Minimizes or eliminates jetting and pumping

    • Continuously inoculates downstream sewer lines with adapted aerobic bacteria

    • Minimizes floating grease and maintains lines free of grease buildup

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  • Vault Toilets

    IMET® Vault Module (IVM)

    • Reduction of H₂S odors to negligible levels

    • Minimize or eliminate pump truck pumping

    • Sustained biological treatment of bio-solids

    • Deployable both on and off grid

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  • NSF / ANSI 40 & 245 Systems

    (ITM - Residential Septic)

    • BOD, TSS and Total Nitrogen reduction meeting discharge requirements

    • Minimal to no bio sludge production

    • Minimizes pumping requirements

    • Minimal to no H₂S odor

    • Highly diverse and large population of aerobic bacteria sustained within the module

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