PureTerra Ventures

Founded in 2016, Membrion specializes in manufacturing and commercializing advanced membrane filtration technologies. Its products are designed to filter molecules under diverse conditions, serving applications such as flow batteries, water purification, fuel cells, and pharmaceuticals.

Cerahelix designs and manufactures ceramic membrane filters for water purification, resource recovery, and related filtration applications. It offers ceramic microfiltration membranes and housings, including single-channel elements for lab-scale studies and multi-channel elements for commercial-scale projects, as well as filter element housings and laboratory test systems that are sold or leased. Its bio-derived membranes utilize a patented DNA-template technology to form sub-nanometer pores in ceramic material, enabling molecular-level separation of salts, metal ions, and other impurities. The company serves industries such as food and beverage, mining, produced water, fine chemicals, bio-based products, pharmaceuticals, renewables, and waste-to-energy. Founded in 2011, Cerahelix is based in Orono, Maine.