In 2001, the international NGO, iDE, introduced ceramic water filters as an affordable water treatment option to benefit public health and environment in Cambodia. In 2009, iDE spun off Hydrologic Social Enterprise Co. Ltd. as a wholly owned subsidiary to scale up filter production and distribution. Hydrologic aims to be the leading distributor of effective and affordable Water, Sanitation, and Hygiene (WASH) products throughout Cambodia. Hydrologic’s core business activities include production, sales, and distribution of two filter models under the Tunsai and Super Tunsai brands. To date, more than 500,000 filters have been sold in Cambodia. Hydrologic is a social enterprise with objectives for both financial achievement and positive social impact through improved public health, environmental care, stimulation of rural economic activity, and a commitment to ethical business practice.