Desalination plants are thirsty beasts. For every liter of clean water they produce, they discharge a liter or more of concentrated brine, a salty, chemical-laden waste stream that is expensive to manage and ecologically tricky to dispose of. In Porto, a pair of chemical engineers looked at that liability and saw a resource stream. Their startup, Seamoretech, is building containerized systems that plug into existing desalination infrastructure, promising to squeeze more freshwater from the waste while pulling out saleable minerals like magnesium and lithium. It is a classic climate tech proposition: turn a cost center into a revenue line, and do it with a lower carbon footprint.
The academic wedge
Seamoretech is a 2021 spinout from the University of Porto’s Faculty of Engineering (FEUP), and its technology is rooted in the doctoral work of its founders, Sofia Teixeira de Sousa Delgado and Eva Sousa. Both hold PhDs in Chemical and Biological Engineering from the university, and their research focused on advanced materials and processes for environmental applications [F6S]. The core innovation is a proprietary forward-osmosis process designed to treat 100% of the brine, achieving what the industry calls zero-liquid-discharge (ZLD) [Seamoretech Information]. The company claims the system can double the freshwater recovery from a desalination plant’s waste stream and cut the carbon footprint of the resource recovery process by 80% [F6S]. For plant operators, the math is simple on paper: reduce disposal costs and compliance headaches, while creating a new income stream from extracted critical raw materials.
The funding and the roadmap
To move from the lab to industrial sites, Seamoretech has raised a total of €3 million, according to a company report from October 2026 [EU-Startups, November 2026]. The most recent closing was a €1.1 million seed round that month, led by Rypples and 7Seas Capital with participation from Crédito Agrícola [EU-Startups, November 2026]. Other investors listed in its cap table include Faber Ventures, Corbites Fund, and Rumbo Ventures [F6S]. The capital is earmarked for industrializing the technology and accelerating a commercial launch, with Spain named as the first target market for 2027 [EU-Startups, November 2026]. The company is also actively hiring for key operational roles, including a Chief Operating Officer and a Head of Operations, signaling a shift from R&D to deployment [BuiltIn, Ambicareers].
| Round | Date | Amount | Lead Investor(s) |
|---|---|---|---|
| Seed | March 2026 | $100,000 | Undisclosed [Signalbase, March 2026] |
| Seed (First Closing) | October 2026 | €1,180,000 | Rypples, 7Seas Capital, Crédito Agrícola [EU-Startups, November 2026] |
| Total disclosed funding approximately €3 million as of October 2026 [EU-Startups, November 2026]. |
Where the chemistry meets commerce
The technical promise is compelling, but the commercial path for deep-tech hardware is never a straight line. Seamoretech’s success hinges on proving its unit economics at pilot scale. The value of recovered minerals like lithium or copper must outweigh the capital and operational costs of the containerized system, which includes energy for the forward-osmosis process. The company reports a demonstration collaboration in Spain and is building a pilot-project pipeline in Spain and Egypt [Startup.eu, November 2026], but has not yet named a paying customer or a desalination operator partner. This is the critical gap between a promising technology and a scalable business. The hiring of a COO suggests the founders recognize the need for industrial operations expertise to bridge it.
The competitive landscape for brine valorization is still forming, but Seamoretech is not competing in a vacuum. Its most direct incumbent is not another startup, but the conventional practice of brine disposal itself,deep-well injection, evaporation ponds, or discharge back into the ocean. These are established, if environmentally problematic, workflows. To displace them, Seamoretech’s system must be as reliable as a pipe and cheaper than a fine.
A back-of-the-envelope sense check is useful. A large desalination plant can produce over 100,000 cubic meters of brine per day. If Seamoretech’s technology recovers, say, an additional 10% of that as freshwater, that’s 10,000 cubic meters,or 10 million liters,of water per plant per day that no longer needs to be sourced. The mineral yield is harder to estimate without knowing brine composition, but even trace concentrations of lithium, given the volume, could become meaningful. The company must prove its containers can handle that scale, day in and day out, without fouling membranes or demanding exotic maintenance.
For now, the bet rests on the founders’ academic rigor and the patience of European climate tech investors. If the Spanish pilot next year shows the numbers work, Seamoretech won’t just be selling a clever piece of kit. It will be selling a new operating manual for the world’s coastal water plants. The incumbent it must beat is the dump truck.
Sources
- [EU-Startups, November 2026] Porto’s female-led startup Seamoretech secures €1.1 million to turn desalination brine into freshwater and critical minerals | https://www.eu-startups.com/?ibsa=get_content&id=482
- [Signalbase, March 2026] Seamoretech Secures $100K Investment | https://www.trysignalbase.com/news/funding/seamoretech-secures-100k-investment
- [Startup.eu, November 2026] Porto-based Seamoretech raises €1.1 million in seed round to scale brine-to-resource technology | https://www.startup.eu/investments/seamoretech-1-1-m-seed-11-2026
- [F6S] Seamoretech SA | https://www.f6s.com/company/seamoretechsa
- [Seamoretech Information] Company Profile | https://rocketreach.co/seamoretech-profile_b719a975c487ae73
- [BuiltIn] Chief Operating Officer (COO) | https://builtin.com/job/chief-operating-officer-coo/11335005
- [Ambicareers] Head of Operations | https://ambicareers.freshteam.com/jobs/bHbxnki4qN-S/head-of-operations