Nereus

What Nereus does

NEREUS SAS is a French industrial water treatment company founded in 2013 in Le Pouget (Occitanie), specializing in the design, manufacture, installation and operation of on-site wastewater treatment and reuse systems. The company has built its offering around a proprietary dynamic non-tangential filtration technology using ceramic membranes that requires no consumables and operates across wide pH and temperature ranges, marketed under product brands Dynasep® (industrial/heavily loaded effluents), Recynov® (vinasse and dairy effluent recycling, demonstrated at 960 m³/day at Distillerie du Simon in Martinique), NeoStep® (building-scale greywater reuse), Aquafiber® (hollow fiber nanofiltration for residential complexes), Greenbow® (urban cooling and green space irrigation from sewer water, deployed at Paris 2024 Olympics) and MOBILIS (mobile pilot unit).

NEREUS serves five primary verticals — Industries, Food & Beverage/Agroalimentaire, Tourism, Buildings and Municipal — with solutions engineered for compliance with the July 12, 2024 French decree on water reuse and for removal of microplastics, pesticides, pharmaceutical residues and PFAS. The company goes to market via direct enterprise field sales supported by an event-heavy marketing motion, offering end-to-end turnkey delivery (studies, pilot testing, custom design, manufacturing, commissioning) typically within four months.

Revenue is generated through three streams: (1) one-time equipment sales of turnkey installations; (2) managed services via ongoing maintenance and operation contracts; and (3) usage-based or fixed-fee payments under Build-Own-Operate (BOO) and Build-Own-Transfer (BOT) financing models, where NEREUS retains or transfers ownership over multi-year contracts. In 2024 the company received private equity investment from QUAERO CAPITAL and was integrated within the Futur'eau water-focused platform, and in 2025-2026 it built a new senior leadership team and expanded into UK and European events to support international growth.

Name

Nereus

Legal name

NEREUS SAS

Website

https://nereus-water.com

Company type

Private

Founded year

2013

Operating status

Operating

Headcount range

11–50 employees

Short description

NEREUS SAS is a French industrial water treatment company (founded 2013, Le Pouget) that designs, manufactures and operates proprietary ceramic-membrane dynamic filtration systems for wastewater reuse and recycling, serving industrial, food & beverage, tourism, building and municipal clients across France and selected international markets.

Ownership category

akta.pro rank

Product category

Industrial Water Treatment

NAICS

Sewage Treatment Facilities (221320), Waste Treatment and Disposal (56221), Water Supply and Irrigation Systems (221310)

SIC

Sanitary Services (4950)

akta.pro primary industry

Water & Wastewater Treatment Plant Equipment (Clarifiers, Aeration, Membrane Systems) (IMAHAEAJ)

akta.pro secondary industries

Separation & Filtration Equipment (Filters, Centrifuges, Membranes) (IMAHAEAB), Membranes, Consumables & Chemicals (Elements, Antiscalants, Cleaning) (EUANAFAJ), Disinfection & Remedial Works (Chlorination, Thermal, Shock Treatments) (BPABAJAF)

Keywords

• Industrial water treatment
• Wastewater recycling systems
• Membrane filtration technology
• Greywater reuse solutions
• Water reclamation equipment

Headquarters

HQ city

Le Pouget

HQ country

France

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Technology or R&D, Operations, Supply Chain, Marketing or Sales, Infrastructure

Revenue model

1. Water Treatment Equipment Sales: Sale of turnkey water recycling and treatment installations including Dynasep®, Recynov®, NeoStep®, and Aquafiber® systems. Equipment is manufactured and tested in NEREUS's workshop, assembled as skid or containerized modules.
2. Maintenance and Operation Contracts: Ongoing maintenance and operation contracts ensuring performance and longevity of installations. Teams remain engaged with clients to optimize water use and enhance resource valorization.
3. Build-Own-Operate (BOO) Model: NEREUS retains ownership of the installation while clients pay based on volume consumed or via fixed payments determined by initial investment, contract duration, and guaranteed volumes. Offers flexible contracts with indexed annual rates.
4. Build-Own-Transfer (BOT) Model: Ownership transferred to client at end of contract period. Alternative financing arrangement with payments spread over long term.

Pricing tiers

Go-to-market motion3 records

Distribution channels3 records

Marketing channels5 records

Core offering

Nereus designs, assembles, commissions, and operates industrial installations for the treatment, reuse, and recycling of wastewater on client sites. Offerings span turnkey skid- or container-mounted membrane filtration units (Dynasep®, Recynov®, NeoStep®, Aquafiber®, Greenbow®) plus optional Build-Own-Operate and Build-Own-Transfer financing, ongoing maintenance, and full operation services for industrial, food and beverage, tourism, building, and municipal customers.

Product overview

NEREUS offers a comprehensive portfolio of water recycling and treatment solutions based on three core membrane technologies: dynamic non-tangential filtration (Dynasep®), hollow fiber nanofiltration (Aquafiber®), and reverse osmosis. The product lineup includes Dynasep® for industrial wastewater treatment, Recynov® for vinasse and effluent recycling in food processing, NeoStep® for building-scale greywater treatment, Aquafiber® for residential greywater reuse, and Greenbow® for urban cooling applications. The company provides end-to-end services from pilot testing and custom design to manufacturing, installation, commissioning, and operation with flexible financing options (BOO/BOT models).

Differentiator

Problem solved

Functional benefit

Brands

• DYNASEP®: Dynamic non-tangential filtration technology range using robust ceramic membranes for heavily loaded water, effluent purification, and concentration of valuable ingredients. Deployed for public space applications such as the Paris 2024 Olympic cooling island.
• RECYNOV®
• NEOSTEP®
• AQUAFIBER®
• GREENBOW
• MOBILIS

Products and services

• Dynasep® Industrial wastewater treatment system using dynamic non-tangential filtration with proprietary ceramic membranes. Designed for heavily loaded waters and high-viscosity effluents across wide pH and temperature ranges, minimizing fouling for WWTPs, food processing, chemical, and pharmaceutical sectors. Removes microplastics, pesticides, pharmaceutical residues, and PFAS.
• Recynov® Vinasse and industrial effluent recycling unit that extracts and reuses water from process wastewater. Enables near water self-sufficiency for distilleries, dairy plants, and food processing facilities, with reusable water output and concentrate valorized through composting or biomethanization.
• NeoStep® Compact building-scale greywater treatment and reuse system. Treats greywater from showers, kitchens, and toilets at the point of use to produce water for toilet flushing, laundry, green space irrigation, and floor cleaning in residential and commercial buildings, with very low energy consumption.
• Aquafiber®

Quantifiable outcome

• Up to 80% of treated water can be reused
• +5 more outcomes

Named customers8 records

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Twelve partnerships are on record, tiered minor and strategic.

• Coq Vert CommunityminorOthers · 1 June 2026Joined Coq Vert community in June 2026, a collective of companies committed to ecological and energy transition. Reinforces NEREUS's mission to develop innovative and sustainable solutions for water recycling and recovery.
• AFREG (Alliance Française pour le Recyclage des Eaux Grises)strategicStrategic or Co-development Partner · 26 May 2026Joined AFREG in May 2026 as a step toward strengthening expertise and commitment to sustainable water management. Combines forces with a network of committed stakeholders working to promote and develop greywater recycling solutions in France.
• Curio GroupminorGTM or Marketing Partner · 19 May 2026Exhibiting together at Utility Week Live Birmingham (May 19-20, 2026) at Stand F16. Partnership centered on joint market presence at industry events to showcase combined water treatment solutions.
• La French FabminorOthers · 5 January 2026Received La French Fab label in January 2026, affirming commitment to designing and manufacturing water recycling solutions in France. Network of industrialists committed to French manufacturing excellence.
• ADEMEminorOthersListed as partner organization. ADEME (Agence de la Transition Écologique) is the French Agency for Ecological Transition.
• Region OccitanieminorOthersListed as regional partner organization providing support for Occitanie-based industrial development.
• INRAEminorStrategic or Co-development PartnerListed as partner. INRAE (Institut national de recherche pour l'agriculture, l'alimentation et l'environnement) - research partnership for water treatment technology development.
• INSAminorStrategic or Co-development PartnerListed as partner. INSA (Institut national des sciences appliquées) engineering school partnership for technical expertise and talent.
• AquavalleyminorOthersListed as partner. Aquavalley is a competitiveness cluster for water treatment and marine resources.
• IMT Mines AlèsminorStrategic or Co-development PartnerListed as partner. Engineering school partnership for technical expertise and student talent pipelines.
• ASTEEminorOthersListed as partner. ASTEE (Association Scientifique et Technique pour l'Eau et l'Environnement) - professional association for water and environment professionals.
• SAVE Project Partners (SAPOVAL, Institut Européen des Membranes, LGC Toulouse, TBI, CRBE CNRS)strategicStrategic or Co-development PartnerSAVE (Station Avancée pour la Valorisation des Effluents) project coordinated by NEREUS. Involves co-pilotage with multiple research institutions including SAPOVAL, Institut Européen des Membranes (Montpellier), Laboratoire de Génie Chimique Toulouse, Toulouse Biotechnology Institute, and Centre de Recherche sur la Biodiversité et l'Environnement (CNRS). Project aims to produce water without detected micropollutants or antibiotic resistance risks.

Scale indicators7 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• WABAG: International water treatment EPC and services company focused on municipal and industrial water and wastewater plants, including reuse schemes. Comparable customer base to NEREUS but operating as a large engineering contractor rather than a focused membrane specialist.
• Veolia Water Technologies: Global water treatment major with a broad portfolio including industrial water reuse, municipal wastewater and advanced membrane solutions. Comparable because it serves the same industrial, municipal, and food & beverage clients with water recycling offerings, though as one of many services rather than a focused niche player.
• Suez Water Technologies & Solutions: Large incumbent providing water and wastewater treatment solutions to industrial and municipal customers, including membrane-based reuse systems. Directly comparable customer overlap with NEREUS, but operates at much larger scale and across a far wider product/service portfolio.

Direct peers

• Ovivo: Pure-play water and wastewater treatment equipment provider serving industrial and municipal markets with filtration and membrane systems. Comparable to NEREUS as a focused equipment specialist competing for similar industrial and municipal reuse projects.
• Pall Water: Industrial water treatment and membrane filtration business under Danaher, providing reuse and recycling solutions to industrial and municipal customers. Comparable to NEREUS for the industrial water reuse and membrane-based treatment use cases.
• Toray Membrane: Leading manufacturer of reverse osmosis, nanofiltration, ultrafiltration and MBR membranes used in water reuse and industrial wastewater. Comparable to NEREUS at the membrane technology layer, though Toray sells membranes as components rather than full turnkey recycling systems.
• De Nora Water Technologies: Provides water and wastewater treatment systems, including filtration and disinfection solutions for industrial and municipal clients. Comparable in product breadth and customer segments to NEREUS, particularly for industrial water recycling and reuse.
• Pentair X-Flow: Membrane technology specialist offering hollow fiber ultrafiltration and nanofiltration modules for water reuse and wastewater treatment. Closely comparable to NEREUS's Aquafiber® line in membrane architecture and target use cases (greywater reuse, building-scale and industrial recycling).

Emerging players

• Aquaporin: Danish specialist in biomimetic forward osmosis and hollow fiber membrane technology for water reuse and concentration. Comparable to NEREUS as a smaller, technology-focused player in advanced membrane-based water treatment, though targeting somewhat different duty cases.
• NX Filtration: Dutch nanofiltration membrane company offering hollow fiber NF technology for water reuse, micropollutant removal, and industrial applications. Highly comparable to NEREUS's Aquafiber® hollow fiber NF approach and overlapping target use cases in greywater and industrial reuse.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/@nereuswater
• LinkedInlinkedin.com/company/nereusfrance
• Xx.com/nereuswater
• Facebookfacebook.com/nereusfrance

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Nereus