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What we do
We got used to poisoning things slightly, and we stopped accepting that the price has to be paid. Here’s what that looks like when you build it instead of just believing it.
We treat water where the problem starts, and we make the chemistry where it is used.
Clera d.o.o. is a cleantech company in Koper, Slovenia. We work on the gap between what European environmental law now requires and what an industrial site can actually do on a Tuesday morning — IED 2.0, CSRD, REACH, the Biocidal Products Regulation. Regulation arrives as a deadline; we turn it into equipment that runs.
Two ideas run through everything we build. First: move the treatment to the source instead of piping the problem somewhere else. Second: produce the active chemistry on site instead of buying it, trucking it and storing it. Both remove cost, risk and carbon at the same time, which is why we keep coming back to them.
What we offer
On-site hydrogen peroxide
A gas diffusion electrode microreactor that makes hydrogen peroxide from water, air and electricity, at the point of use. Nothing to transport, nothing to store under hazard rules, no halogenated residue on the product. The peroxide does its work and decomposes into water and oxygen.
One detail matters more than it sounds: our peroxide contains no stabilisers. Commercial peroxide is stabilised so it survives shipping and storage, and those same stabilisers suppress the hydroxyl radicals that advanced oxidation depends on. Making it on site removes the need for them entirely.
The technology runs under an exclusive licence covering electrochemical on-site generation of hydrogen peroxide, including the biocidal-products regulatory pathway (BPR Article 95). It is validated in a relevant environment and is being taken onto real production lines now.
Where it fits: clean-in-place · advanced oxidation · agriculture and fertigation · cooling systems · food processing · pharmaceuticals · glassworks · brewing · aquaculture.
Advanced oxidation for the hard cases
Some effluents defeat biological treatment outright. For those we combine hydrogen peroxide with high-frequency ultrasound. Acoustic cavitation creates extreme conditions inside collapsing bubbles and drives the formation of hydroxyl radicals — far more aggressive oxidants than ozone.
We are developing this line for a specific case: glycol-loaded process water from paints and resins, at chemical oxygen demand around 170,000 mg/L. That is an order of magnitude beyond what conventional treatment handles. The same chemistry is our development route towards breaking down PFAS, which is a target we are working to prove, not a result we are claiming.
For narrow, awkward geometries — dosing and syrup lines a few millimetres across, full of bends — we add oxygen nanobubbles. They carry the cleaning solution into biofilm that a flush cannot reach, extend the life of the oxidising radicals, and break up hardened deposits mechanically without attacking the pipe.
Microplastic removal and water reuse
Decentralised, modular filtration built around a silicon carbide ceramic membrane, with ozone for in-place self-cleaning so the membrane does not foul its way to a standstill. It runs without dosing chemicals. Where the law and the water quality allow it, a large share of the treated water goes straight back into the process rather than down the drain.
It is deployed and measured in EU projects at a marina and at an industrial laundry — the numbers, with their locations and sources, are on our Projects page. We would rather point you at measured results than at a specification sheet.
Monitoring, and the proof that goes with it
Treatment without measurement is a belief system. We install real-time sensing — including stripping-voltammetry sensors that move heavy metals monitoring out of the laboratory and into the field — and we cross-validate every sensor against parallel laboratory analysis before we trust it.
Around that sits the data layer: continuous logging of what was dosed, when, at what concentration, at what energy cost. That record is what turns hygiene and discharge into something auditable — for CSRD reporting, for retailers, for certifiers, for the site’s own internal audit.
How we work
We measure the baseline before we design anything. Every site we have worked on has surprised us. A marina’s wash water turned out to carry an order of magnitude more plastic than expected, with chloride and sulfate swinging wildly between campaigns. You cannot size equipment against an assumption.
We validate independently. Our results in EU projects are checked by university and institute partners, with cross-validation by a second analytical method. If it only works when we measure it, it does not work.
We say what does not work. In one project the plan was to recycle treated water back into operations; the national legal framework made that impossible and we said so in writing, then re-targeted the system at fully compliant discharge. Clients get the constraint early, not in year three.
We build for replication. A single successful installation is an anecdote. Our systems are modular, and the protocols, the sampling plan and the maintenance and calibration routines are written down so the next site does not start from zero.
Who we work with
Growers and packing houses · food and beverage processing · marinas, ports and shipyards · industrial laundries · paints, resins and chemical manufacturing · municipalities and public authorities with an environmental obligation · research consortia looking for a partner who builds and installs, not only writes.
Have a water or hygiene problem that is costing you money, risk or compliance headaches? That is exactly the conversation we want.
Clera d.o.o. · Ferrarska ulica 30, 6000 Koper, Slovenia · info@clera.one
