Our Factory

Our smart but simple technology is based around a ceramic water filter that is easily mass produced in our Cambodia factory.


Hydrologic manufactures the filters in factory 40 km from Phnom Penh, employing 25 staff.


Local clay is mixed with powdered rice husk, pressed into pot shape, smoothed by hand and baked in a kiln for 12 hours at 830 C°.


The rice husk burns away leaving microscopic pores that trap micro-organisms. Silver nitrate provides a second barrier against bacteria.


The rest of the package – receptacle, spigot and stand are produced and shipped from Vietnam and USA.


The filters are flushed for 24 hours to remove any clay dust remaining in the pores.


The water flow is tested to keep it at 2-2.5 L per hour and water samples are collected for quality testing to meet the Gold Standard.

The Super Tunsai water filter is designed, developed, produced and distributed by Hydrologic, a social enterprise in Cambodia.

In Cambodia, untreated water and poor sanitation cause an estimated 10 million cases of diarrhoea and 10,000 deaths each year, mostly in rural areas among children under the age of five. Diarrhoea and other waterborne diseases impose a heavy economic burden due to healthcare expenses, lost labor productivity, and missed school days for children.

Rural households get their drinking water from multiple sources that vary by location and season. Common sources include rivers, lakes, ponds, wells, rainwater catchment, and local vendors who deliver water by pipe, truck, or wagon. These sources are often contaminated due to poor sanitation, unsafe storage, and fouling by animals.

Hydrologic is a social enterprise that manufactures, distributes and sells ceramic water filters across Cambodia. Its roots go back to 2001 as a safe water program initiated by international NGO, iDE and to date Hydrologic distributed more than 500,000 water filters, under brand Tunsai, across Cambodia. Since 2010, Hydrologic is registered as a pro-profit business, which creates value for its customers across the country by providing long lasting product, that significantly contributes to public health, environmental benefits and stimulation of rural economic activity.

About 72% of rural households treat their drinking water by boiling it. This can be effective but, in practice, boiling is usually not done properly or consistently. Boiling also comes at an environmental cost. The majority of rural households use wood or charcoal as fuel, resulting in greenhouse gas emissions and increased stress on forest resources in a country that already has one of the highest rates of deforestation in the world. Hydrologic saves about 130,000 tons of CO2 every year by shifting customers away from using wood or charcoal and opting for another water treatment method.


Orders for NGOs, Non-profits

Hydrologic’s products are built around Ceramic Water Purifiers (CWPs), which have set the standard for cost-effective water treatment in developing countries for the past 30 years.

Small-scale ceramic filtration has a long history, having been used in various forms since antiquity. Locally produced ceramic pot-style filters have the advantages of being relatively inexpensive, chemical free, low-maintenance, portable, effective, and easy to use. The filters remove microorganisms from water by gravity filtration through porous ceramics, with typical flow rates of 2-3 liters per hour.


Carbon Offset

Hydrologic saves about 130,000 tons of CO2 every year by shifting customers away from using wood or charcoal and opting for another water treatment method.

We offer you the option to offset your carbon footprint by buying carbon credits for your enterprise through Gold Standard website. Just click the button below.

  • Do you want to Offset your travel?
  • Do you want to contribute to Hydrologic’s mission?