De.mem is an Australian company specializing in decentralized water and wastewater treatment solutions for industrial, municipal, and residential customers. It designs, builds, owns, and operates its systems, leveraging proprietary hollow fiber membrane technology to deliver membrane-based, disinfection, filtration, biological, and chemical treatment processes, along with sludge management and other specialized methods. The company offers equipment sales, project delivery, life‑cycle services, automation tools, and ongoing operation and maintenance, with capabilities spanning potable water, sewage, industrial wastewater, recycling, desalination and process water. It serves sectors including mining, electronics, chemicals, oil and gas, and food and beverage, and pursues water reuse and regulatory compliance to reduce client costs. Operating in Australia, Singapore, and Germany, De.mem collaborates with researchers to advance its technology and supports turnkey, decentralized solutions, sometimes under a build‑own‑operate model to reduce upfront capital expenditure.