Andersson Water

What Andersson Water does

Andersson Water is a privately held Swedish engineering firm that designs, markets, and supports mechanical equipment for water and wastewater pre-treatment, with a specialization in fine screening at plant headworks. The company originated from inventor Carl-Otto Wallander's work in the 1970s-1980s and formally launched its product line in 2000-2001 in collaboration with Wallander, whose Step Screen concept revolutionized mechanical water screening by enabling 1-6mm bar spacing in existing concrete channels with self-cleaning operation and no brushes or flushing.

The core technology platform is the Step Screen family — the Progressive Stair Screen (PSS) and the Andersson Stair Screen (ASS) — built around interleaved self-supporting sets of step-shaped bars and a chain-free submersible linkage transmission that the company claims is the strongest drive ever made on a step screen. The product portfolio extends beyond screens into screenings handling (Wash Press Compactor, Back Pressure Shredder, Ram Press Compactor), grit separation (Circular and Rectangular Grit Traps, Grit Washer Classifier), sludge reception (Septic Sludge Receiver), integrated pre-treatment modules (Compact Combi Unit, Small Combi Unit), tank equipment (KKR Plastic Chain Scraper, Chain Scraper Skimmer), and flow control (Dam Flap Gate). Equipment is engineered to ISO and CE norms and manufactured under contract by Anderssons Svets och Mekaniska AB at a facility in Mariestad, Sweden, while design, sales, and support sit in Gothenburg.

The business model is project-based B2B sales of custom-engineered capital equipment, sold either directly to large municipal wastewater treatment plants and industrial facilities or through a global distributor network. The company cites over 20,000 step screen installations across more than 30 years and a reference list spanning Stockholm Henriksdal, Gothenburg Rya, Malmö Sjölunda, Reykjavik Klettagardar, and Norwegian WWTPs alongside food processing and paper mill customers. Revenue is not publicly disclosed, pricing is quote-based per project, and there is no indication of recurring service or software revenue streams.

Name

Andersson Water

Legal name

Andersson Water

Website

https://anderssonwater.se

Company type

Private

Founded year

2000

Operating status

Operating

Headcount range

1–10 employees

Short description

Andersson Water is a Swedish privately held manufacturer of mechanical water and wastewater pre-treatment equipment, specializing in proprietary Step Screen fine screening technology sold to municipal wastewater plants and industrial customers globally.

Ownership category

akta.pro rank

Product category

Water and Wastewater Treatment Equipment

NAICS

Other General Purpose Machinery Manufacturing (3339)

akta.pro primary industry

Process Skids & Modular Process Systems (Packaged Units) (IMAHAEAH)

Keywords

• Wastewater screening equipment
• Step screen technology
• Screenings handling systems
• Grit separation equipment
• Water pre-treatment machinery

Headquarters

HQ city

Gothenburg

HQ country

Sweden

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Mechanical Screening Equipment Sales: Sale of mechanical equipment for water and waste treatment including screens, screenings handling equipment, grit classifiers, compactors, and related machinery. Equipment is produced according to ISO and CE norms.
2. Custom Industrial Equipment: Sale of specialized mechanical pre-treatment systems such as Compact Combi Units (CCU) and Small Combi Units (SCU) for complete wastewater treatment solutions.
3. Design and Project Services: Design and project team services for screen projects including application knowledge and engineering support for implementation.

Go-to-market motion2 records

Distribution channels2 records

Marketing channels1 record

Core offering

Andersson Water designs, produces, and markets mechanical equipment for water and wastewater treatment, with a specialization in step-type fine screens for wastewater plant headworks and screenings handling. The core offering centers on the patented Progressive Stair Screen (PSS) and Andersson Stair Screen (ASS) technologies, supported by complementary drum screens, band screens, grit traps, wash press compactors, and integrated combi units (CCU/SCU). Equipment is manufactured in Sweden to ISO and CE standards and sold globally through direct enterprise sales and a distributor network.

Product overview

Andersson Water is a Swedish mechanical equipment manufacturer specializing in wastewater pre-treatment and screenings handling systems. The product portfolio centers on step screen technology (Progressive Stair Screen PSS and Andersson Stair Screen ASS) as the core offering, complemented by a comprehensive range of supporting equipment including alternative screening solutions (Channel Drum Screen CDS, Through Flow Screen TFS, Center Flow Screen CFS, Spiral Sieve Screen SSS, Chain Rake Screen CRS, Spiral Weir Screen SWS), screenings treatment equipment (Wash Press Compactor WPC, Back Pressure Shredder BPS, Ram Press Compactor RPC), grit separation systems (Circular Grit Trap CGT, Rectangular Grit Trap RGT, Grit Washer Classifier GWC, Grit Separator Classifier GSC), sludge handling (Septic Sludge Receiver SSR), integrated pre-treatment systems (Compact Combi Unit CCU, Small Combi Unit SCU), tank equipment (Chain Scraper Skimmer CSS, Plastic Chain Scraper KKR), material conveyors (Spiral Screw Conveyor SSC, Blow Gun Cannon TOR), and flow control (Dam Flap Gate DFG). Products are manufactured in Sweden according to ISO and CE norms, with references and distributors worldwide.

Differentiator

Problem solved

Functional benefit

Products and services

• Progressive Stair Screen (PSS) Self-cleaning step screen with 1-6mm bar spacing for fine screening in wastewater treatment channels, providing high flow capacity and an 80% capture rate on 3mm bar spacing. Used at municipal wastewater headworks and industrial pre-treatment applications.
• Andersson Stair Screen (ASS) Original step screen design featuring submersible linkage transmission system, automatic bottom seal flap, and a drive built to deliver the strongest operation on a step screen. Used in municipal and industrial wastewater screening applications.
• Channel Drum Screen (CDS) Drum screen for channel installation providing mechanical screening for water and wastewater treatment applications.
• Through Flow Screen (TFS) Band screen for continuous flow screening in municipal and industrial wastewater treatment.
• Center Flow Screen (CFS) Center-fed screen design for wastewater screening with continuous screening operation.
• Spiral Sieve Screen (SSS) Spiral-based screening system for screenings separation with compact design suitable for small-scale applications.
• Chain Rake Screen (CRS) Multi-rake chain screen positioned as the strongest rake screen on the market, primarily used as >20mm coarse screens in deep pumping stations.
• Spiral Weir Screen (SWS) Screen system integrated with weir design for level control and screening in wastewater channels.
• Spiral Screw Conveyor (SSC) Conveyor system for transporting screenings, grit, and other solids dewatered from wastewater treatment processes.
• Wash Press Compactor (WPC) Equipment for washing, pressing, and compacting screenings to reduce volume and weight, using S355J steel screws for wear resistance.
• Back Pressure Shredder (BPS) Accessory for the Wash Press Compactor providing mechanical crushing agitation and controlled retention for maximum washing, dewatering, and compaction, achieving 45-55% dry solids content.
• Ram Press Compactor (RPC) Hydraulic piston press for transporting, dewatering, and compacting screenings from 10-15% to >25-35% dry solids, featuring double trough design and 5-8mm thickness.
• Circular Grit Trap (CGT) Tangential-flow circular grit trap using vortex separation with peripheral air lift pump for sand extraction from wastewater.
• Rectangular Grit Trap (RGT) Rectangular grit trap with sand pump pipe systems for sand separation; available in aerated/non-aerated versions with capacity 60-3000 l/s.
• Grit Washer Classifier (GWC) Separates, washes, and dewaters sand with loss on ignition <5%; features the largest volume and thickest spiral (20-25mm) among grit washers, achieving 90% dryness.
• Grit Separator Classifier (GSC) Separates and dewaters sand from water using a screw conveyor, handling street sand, filter sand, and similar materials with 10-30 l/s capacity.
• Septic Sludge Receiver (SSR) Self-cleaning system for screening septic import sludge from tanker trucks (25-50 l/s, 1-6 m3/min at 1-4% DS) with integrated stone trap and Wash Press Compactor.
• Compact Combi Unit (CCU) Complete mechanical pre-treatment system featuring Progressive Stair Screen, Wash Press Compactor, and optional grit classifier; designed for efficient shipping with modular construction.
• Small Combi Unit (SCU) Compact pre-treatment system for 5-30 l/s capacity combining screening with integrated Wash Press Compactor and grit classifier in a modular design.
• Chain Scraper Skimmer (CSS) Multi-flight chain scraper for sludge and grease removal from water surfaces in grease traps, settling tanks, and DAF units with 400-1600 kg chain strength.
• Dam Flap Gate (DFG) Top-mounted swinging flap gate for water level control with pneumatic actuation; maintains stable back level without hinges, seals, or joints underwater.
• Blow Gun Cannon (TOR) Pneumatic pipe conveying system (200-2000L volume, 20-500m length, 2-20 m3/h capacity) for long-distance transport of dry, wet, or abrasive materials.
• Plastic Chain Scraper (KKR) World's strongest plastic chain scraper with >5.5 ton break load; enables 15m wide scrapers (double competitors' 7m) with buoyant stainless scraper flights running on wheels. Features a patented tank surface level adapting float-connected scum screw skimmer and precision skimmer hopper.

Quantifiable outcome

• 80% capture rate on 3mm step screens (comparable to 6mm perforated screens)
• +5 more outcomes

Named customers16 records

Segments3 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• Anderssons Svets och Mekaniska ABcoreOthersContract manufacturing partner producing Andersson Water products at their facility in Ingarud Fagerhult, Mariestad, Sweden. Anderssons Svets och Mekaniska AB handles production while Andersson Water handles design, marketing, sales, and support.

Scale indicators5 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• Evoqua Water Technologies: Major water and wastewater treatment equipment and services provider. Its screening and pre-treatment product lines compete with Andersson in industrial and municipal applications.
• Xylem Inc. Large global water technology company with a broad portfolio spanning pumps, treatment and analytics. Overlaps with Andersson through its screening and wastewater treatment brands serving the same municipal customers.
• Veolia Water Technologies: Global water and wastewater treatment solutions provider with extensive equipment and services portfolio. Touches Andersson's market through headworks screening and pre-treatment offerings for municipal and industrial customers.
• Smith & Loveless: Long-established US manufacturer of wastewater treatment equipment including headworks screening, grit removal and packaged pump stations. Wider portfolio than Andersson but directly comparable in screening and pre-treatment categories.

Direct peers

• Parkson Corporation: North American supplier of municipal and industrial water/wastewater treatment equipment, including screening, grit removal and solids handling. Overlaps with Andersson's screening and pre-treatment portfolio at the same municipal customers.
• Vulcan Industries: US manufacturer of screening and grit handling equipment for water and wastewater treatment plants. Comparable offering to Andersson's drum screens, rake screens and grit separation products.
• Huber SE: German-headquartered manufacturer of wastewater screening, grit removal and sludge handling equipment. Direct head-to-head competitor to Andersson in municipal headworks fine screening, including step screens, drum screens and screenings handling.
• MST GmbH (Mesh Separator Technology): German specialist in fine screening and screenings handling for municipal wastewater plants. Competes with Andersson's step screens and screenings wash/press equipment in European tenders.
• Hydro International: UK/US water and stormwater treatment equipment vendor with screening, grit and solids separation products serving municipal and industrial customers. Competes with Andersson on headworks screening and grit handling solutions.
• Duperon Corporation: US-based step screen and screening equipment manufacturer for municipal wastewater headworks. Closest North American analog to Andersson's Progressive Stair Screen (PSS) and Andersson Stair Screen (ASS) product lines.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/andersson-water

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 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 Andersson Water