How do you manage an aquifer nobody can see, and what changes when iFlux measures how its groundwater moves?

iFlux is a Belgian company that measures how groundwater moves: its speed, its direction, and how much contamination travels with it. Most tools only give snapshots, a water table level here, a nitrate concentration there, while groundwater flows anywhere from 2 centimeters to 2 meters a day. So I sat down with its CEO to find out what measuring that movement changes.

Christian Montag joined iFlux in 2023 as operations director, coming from lean consulting with no background in hydrogeology, raised the round that brought in PureTerra as lead investor, then took over as CEO from co-founder Tim.

🌶️ KEY SPICES 🌶️

🌊 Flux versus flow: cover half a hose with your thumb and the same water comes out at a different speed, which is what happens to groundwater squeezing through sand and sediment

🗺️ My dad's 35-kilometer pollution plume in eastern France, and why every new sampling campaign drifted from what his model predicted

📍 Why PFAS sitting still is a smaller risk than the same PFAS moving toward a river, a town or a nature reserve

💧 A managed aquifer recharge site in the Netherlands, where river water filters through the ground before it becomes drinking water, and the three questions it needed answered

🏭 Groundwater pumping on a worst-case permit: why an industrial site may pump in the wrong places for years and still prefer not to know

✅ How flux data let one industrial site prove its cleanup had worked and switch to monitoring, saving 90 to 95% of the cost

🔬 3.6 million euros from the European Innovation Council (EIC), and full-scale deployments at three drinking water utilities

🤝 Why environmental consultants are iFlux's route to scale, and whether its data platform helps them or competes with them

⛏️ Oil and gas, mining and EIT Raw Materials: the markets I kept pushing Christian toward

📈 The pitch: 27% growth last year, 75% targeted this year, and a 5 million raise that could open up to 7 million

🏷️ The exit landscape, from AEM buying Van Essen Instruments to Saur buying Imageau, and why strategic buyers do their R&D through M&A

🥜 IN A NUTSHELL 🥜

What does iFlux measure? The speed and direction of groundwater movement, and the mass of contamination moving through the subsoil with it.

Why isn't a good groundwater model enough? Because from the day you release a model into the real world, the real world drifts away from it, and flux lets you calibrate with a vector instead of a single point.

Who buys it? Industrial sites, drinking water utilities and cities, mostly through environmental consultants, of which iFlux wants to focus on two handfuls out of about 30 big ones worldwide.

What is the 5 million for? Commercial rollouts through partner ecosystems in each country, more sensor development, and data-driven models that move from measuring to predicting.

When should iFlux pay its own bills? Christian aims for a self-sustaining state in 2028.

#️⃣ Mentioned Links #️⃣

📌 iFlux, Christian's company: https://iflux.be/

📌 Email Christian: christian@iflux.be

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