LiqTech International

What LiqTech International does

LiqTech International, Inc. (NASDAQ: LIQT) is a clean-technology and industrial filtration company specializing in silicon carbide (SiC) ceramic membrane technology for liquid and gas purification. The company was founded in 2000, is incorporated in Nevada, and is headquartered and manufactures in Ballerup and Hobro, Denmark. Its proprietary SiC membranes are deployed across four primary application verticals: commercial swimming pools (QlariFlow branded systems for aquatic centers and leisure facilities); oil and gas produced water treatment (QureFlow and the recently launched QureFlow Max high-capacity configuration, achieving >99% removal of oil and suspended solids at 80–120 m³/h); marine water treatment for scrubber, iCER and EGR engine applications (170+ marine scrubber installations worldwide); and industrial verticals including phosphoric acid purification (PurePhos, removing silica and suspended solids from food-grade acid for major chemical producers), steel/metals wastewater, power plant filtration, and diesel particulate filters for heavy-vehicle emission retrofits (cumulative ~2.5M vehicles). The company has also entered lithium brine and lithium-iron-phosphate battery material adjacent applications.

Name

LiqTech International

Legal name

LiqTech International, Inc.

Website

https://liqtech.com

Company type

Public

Founded year

2000

Operating status

Operating

Headcount range

101–250 employees

Short description

LiqTech International (NASDAQ: LIQT) is a Denmark-based clean-technology company that designs and manufactures silicon carbide ceramic membrane filtration systems for commercial pools, oil and gas produced water, marine vessels, and industrial applications including phosphoric acid purification.

Ownership category

akta.pro rank

Product category

Industrial Water Filtration Systems

SIC

Miscellaneous Chemical Products (2890)

akta.pro primary industry

Separation & Filtration Equipment (Filters, Centrifuges, Membranes) (IMAHAEAB)

akta.pro secondary industries

Membranes, Consumables & Chemicals (Elements, Antiscalants, Cleaning) (EUANAFAJ), Electronic-Grade Solvents, Filtration & Purification (UHP Solvents/Filters/Resins) (HDAHAGAO)

Keywords

• Silicon carbide membranes
• Ceramic membrane filtration
• Produced water treatment
• Marine scrubber filtration
• Diesel particulate filters

Headquarters

HQ city

Hobro

HQ country

Denmark

HQ region

Europe

Offices6 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Water Treatment Systems: Sale of filtration systems including commercial pool systems (QlariFlow), marine water treatment, produced water treatment (QureFlow), and industrial wastewater systems. One-time capital equipment sales with recurring aftermarket component and service revenue.
2. Aftermarket Components and Service: Recurring revenue from replacement filters, membranes, and after-sales service. Systems and aftermarket revenue grew 49% in 2025.
3. Diesel Particulate Filters (DPF): Filters and components for diesel exhaust emission control in large vehicles. Retrofit applications for emission reduction.
4. Ceramic Membranes (OEM and Standalone): Sale of component membranes and membrane systems for industrial, municipal, pharmaceutical, and beverage applications. Includes standalone filter press systems for industrial applications.

Pricing tiers

Go-to-market motion3 records

Distribution channels12 records

Marketing channels6 records

Core offering

LiqTech International manufactures and supplies proprietary silicon carbide (SiC) ceramic membrane filtration systems and diesel particulate filters (DPF). Its products are deployed across oil and gas produced water treatment, marine scrubber and next-generation iCER/EGR water treatment systems, phosphoric acid purification, industrial wastewater treatment, and commercial pool and spa filtration. The company operates in-house ceramic membrane manufacturing capabilities using proprietary furnaces and sells both complete systems and standalone SiC membrane components to OEM customers.

Product overview

LiqTech International is a clean technology company offering specialized filtration products and systems for liquid and gas purification based on proprietary silicon carbide (SiC) ceramic membrane technology. The company's product portfolio centers on its core SiC membrane technology, which is deployed across multiple application-specific systems. The main product lines include: QlariFlow™ for commercial pool and spa filtration; QureFlow™ and QureFlow™ Max for oil & gas produced water treatment; PurePhos™ for phosphoric acid purification; Marine Scrubber Water Treatment and Marine Water Treatment Systems (iCER/EGR) for vessel emissions compliance; and Diesel Particulate Filters (DPF) for emission control. LiqTech also offers PureFlow™ mobile units and the Aqua Solution® membrane as specialized offerings. The products share a common technological foundation in silicon carbide ceramic membranes but are differentiated by application, capacity, and modular system design for specific end markets including swimming pools, marine, oil & gas, industrial wastewater, and phosphoric acid industries.

Differentiator

Problem solved

Functional benefit

Brands

• QlariFlow: Ceramic membrane filtration systems for commercial pool applications
• QureFlow
• QureFlow Max
• PurePhos
• Aqua Solution
• PureFlow
• LiQTech

Products and services

• QlariFlow™
• QureFlow™
• QureFlow™ Max
• PureFlow™
• PurePhos™
• Marine Scrubber Water Treatment Systems
• Marine Water Treatment Systems (iCER/EGR)
• Diesel Particulate Filters (DPF)
• SiC Ceramic Membranes Proprietary silicon carbide ceramic membranes sold as standalone components to OEM customers and integrated into LiqTech's own filtration systems. Used in liquid and gas purification applications requiring chemical, thermal, and mechanical durability.
• Industrial Wastewater Treatment Silicon carbide ceramic membrane-based systems for industrial wastewater treatment and reuse, including applications such as steel wastewater. Designed for industrial facilities seeking water recycling and discharge compliance.
• Water For Energy Silicon carbide ceramic membrane filtration systems for power generation and energy applications, including cooling water and process water treatment. Targets power plants and energy sector operators.

Quantifiable outcome

• 99%+ oil and suspended solids removal rate with QureFlow Max systems
• +6 more outcomes

Named customers9 records

Segments7 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

13 partnerships are on record, tiered core, key and regional.

• Waterco LimitedcoreChannel Partner/ Reseller/ Distributor · 5 May 2026Distribution partnership across Australia and Pacific Islands for swimming pool water filtration systems. Secured record 10-system order for Plumpton Aquatic and Leisure Centre. Partnership drives commercial pool expansion in the region.
• LoteckeyChannel Partner/ Reseller/ Distributor · 28 April 2026Strategic partnership with commercial pool engineering specialist for Northern Europe market. Framework established for future joint municipal and large commercial pool developments. Secured largest commercial pool project to date in Den Helder, Netherlands.
• NAF Aquatics / Treatment Specialties - North American FiltrationcoreChannel Partner/ Reseller/ Distributor · 1 March 2025Distribution and partnership agreement for U.S. commercial swimming pool market. Secured first U.S. pool order for three systems at Weston County School District #1 Aquatic Center in Wyoming.
• Jitri (JiTRI) - Joint VenturecoreStrategic or Co-development Partner · 1 November 2024Joint venture in China for marine water treatment market. Broke ground on marine-focused R&D test center and localization facility. Completed regional spare parts warehouse.
• China Haisum Engineering Co. Ltd.regionalChannel Partner/ Reseller/ Distributor · 1 August 2024MoU for industrial water treatment applications in China.
• Razorback DirectregionalChannel Partner/ Reseller/ Distributor · 1 August 2024Distribution agreement for commercialization of produced water treatment solution in the U.S. Received first U.S.-based oil & gas produced water order.
• Danbee Marine Co. Ltd.regionalChannel Partner/ Reseller/ Distributor · 1 July 2024Agreement for marine scrubber water treatment solutions for the South Korean market.
• FranmanregionalChannel Partner/ Reseller/ Distributor · 1 May 2024Agreement for marine scrubber water treatment solutions for the Greek market.
• Dan Marine GroupregionalChannel Partner/ Reseller/ Distributor · 1 May 2024Agreement to expand marine water treatment solutions to the Chinese market.
• NESR (National Energy Services Reunited)keyChannel Partner/ Reseller/ Distributor · 1 March 2024Distribution agreement for produced water treatment solution for re-injection in Middle East. Delivered pilot unit for Middle East operations.
• Silicon FilterregionalChannel Partner/ Reseller/ Distributor · 1 April 2023Distribution agreement in China for phosphoric acid purification applications.
• LiquinexregionalChannel Partner/ Reseller/ Distributor · 1 February 2023Distribution agreement in Singapore for water treatment solutions.
• Ecolotron Wastewater SolutionsregionalStrategic or Co-development Partner · 1 December 2022Cooperation agreement on combined solution for phosphoric acid purification.

Scale indicators18 records

Recent moves10 records

Expansion highlights6 records

Direct peers

• Pall Corporation (Cytiva): Pall's Membralox product line is the most direct competitor in ceramic crossflow membrane filtration, serving oil & gas, food & beverage, pharma and industrial markets with similar SiC and alumina-based membranes. This is the closest analog to LiqTech's core SiC membrane technology.
• Porvair Filtration Group: Porvair manufactures sintered metal and ceramic filtration media and housings for oil & gas produced water, aerospace, and industrial process filtration. Its proprietary sintered media represents a competing materials-based filtration approach for the same harsh-environment separation challenges LiqTech targets.

Broad incumbents

• Donaldson Company: Donaldson is a global filtration incumbent producing air, liquid, and exhaust filtration (including DPF aftertreatment) for industrial, engine OEM, and OEM replacement channels. It overlaps with LiqTech's DPF business and industrial liquid filtration, with far broader portfolio and channel reach.
• Metso Corporation: Metso supplies separation, classification, and water management equipment to mining, metals, and industrial customers including ceramic and polymer filtration systems. Comparable to LiqTech's industrial water and oil & gas produced water treatment applications.
• Xylem Inc. Xylem is a global water technology major producing a broad range of filtration, pump, and treatment solutions for municipal and industrial water. It is a broader incumbent in the same end markets LiqTech targets with QureFlow and industrial wastewater systems.
• Pentair plc: Pentair manufactures water treatment and filtration products for pools, residential, and commercial water applications. The commercial pool business overlaps directly with LiqTech's QlariFlow franchise, but Pentair operates at vastly larger scale across broader product lines.
• Veolia Water Technologies (Veolia Environnement): Veolia supplies municipal, industrial, and oil & gas water treatment systems globally, frequently as EPC contractor. Competes with LiqTech on large produced water and industrial wastewater projects where Veolia's scale and execution depth are structurally favored.
• 3M Separation and Purification Sciences: 3M supplies a broad portfolio of industrial liquid and gas filtration media and equipment through OEM and after-market channels. A broad incumbent in industrial filtration with overlap to LiqTech's component and system offerings across industrial applications.

Emerging players

• Aquaporin A/S: Danish biomimetic membrane specialist commercializing hollow-fiber forward osmosis and reverse osmosis membranes for water reuse, food, and life-science applications. Different membrane chemistry, but shares Danish origin, water-technology focus, and small-cap public-company profile with LiqTech.
• CoorsTek Membrane Sciences: CoorsTek produces advanced ceramic components including ceramic membranes and substrates for chemical processing and filtration. A partial-overlap emerging player whose ceramic materials expertise intersects with LiqTech's SiC-based membrane innovation.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/liqtech
• LinkedInlinkedin.com/company/264585

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries4 records

Funding overview

Funding rounds3 records

Investors

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

M&A1 record

Investments

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

Frequently asked questions about LiqTech International