WAH Foundation approached Hyflux in 2009 to discuss the production of a specifically designed ultra-filtration unit for use in rural communities, following our research in Cambodia on the chronic health problems the rural communities are facing from drinking contaminated water.


In March 2010 we signed a collaboration agreement with Hyflux, integrating WAH Foundation’s on the ground knowledge and experience in Cambodia, with Hyflux’s technical expertise and membrane technology.

Together we worked on a new filter system.The main factors we took into account in the design of the Free Flow 60 filter were gravity flow, 60 litres per hour, ability to take out all bacteria and viruses, portability, durability, low maintenance, and ease of use.


The result of our joint efforts was the Freeflow 60 gravity operated ultra-filtration unit.

Freeflow 60 Gravity Operated Ultra Filtration System Details


The Free Flow 60 was specifically designed to produce micro-organism safe water for rural communities. Operation is simple using a water tank positioned 2 metres above the filter. The pressure difference created by gravity is sufficient to filter water-borne bacteria, cysts (e.g. Cryptosporidium and Guardia) and viruses from the feed water. Once filtered, the water is safe for personal use. The membrane has a pore size of 0.01 micron, which is tiny (the human hair is around 18-20 micron thick!).   




  • Low operating cost and up to 5 year life span

  • Up to 500,000 litres of clean water every 12 months

  • Removes microbial contamination larger than 0.01 micron

  • Compact. Cylinder 41cm long x 10cm wide.  Weight 1.7 kg

  • Easy to use. Gravity flow, without the need for electrical supply

  • Flow of up to 60 litres per hour (depending on feed water quality)

  • Simple forward flushing (cleaning) after every 10 hours of use


New Bicycle Pump Ultra Filtration System, with Integrated Hand Washing Facility for Schools

In 2014 WAH Foundation designed a new bicycle pump system using one Hyflux ultra filtration filter which is much bigger and produces 500 litres of clean, safe water per hour. The system can be easily used by children. Clean water is stored in 20 litre water dispensers which are placed in the classrooms for use during the day. Children fill their bottles after school to take home.