Seed · Climate Tech · Stockholm, Sweden · Founded 2021 · 10–50 employees
Cler is a Swedish deep-tech company pioneering filter-free, maintenance-free air purification through its proprietary Perpetual Filtration Technology (PFT), which uses centrifugal separation to continuously remove airborne particles down to PM0.5 with no consumables or downtime. The technology is rooted in over 20 years of centrifugal separation R&D originating from Alfa Laval, with Cler operating full-time since 2021. The company raised a SEK 19 million (~$1.98M USD) seed round backed by Norrsken VC, Science Park Gotland Invest, and Almi Invest. Cler is actively expanding commercially across Sweden and planning international growth into Northern Europe and North America, with 11 open roles spanning engineering, sales, logistics, and operations.