Tunsai (Rabbit) Ceramic Water Purifier
The product is a gravity-fed water treatment solution.
Tunsai Ceramic Water Purifier are silver-enhanced ceramic ‘pot’ water filters for household drinking water treatment. This product is manufactured in Cambodia based on the open source technology promoted by Potters for Peace.
Cambodia and exported in Yemen, Srilanka and Vietnam
Two models are produced by Hydrologic, the ‘Tunsai’ (rabbit) which retails for about $13.50 USD and the ‘Super Tunsai’ which retails for $23.50 USD.
Household water treatment methods and products available in local market, including Resource Development International – Cambodia (RDIC) and Engineers Without Borders Australia (EWB Australia)
Goal 6: Clean water and sanitation
Targeted at Cambodian households without access to potable water, earning between $1-$5 USD per person per day.
The product is manufactured from locally sourced clay and rice husk are processed then mixed with water, pressed into the filter shape, fired to a ceramic state, flow rate tested to ensure production consistency and coated with silver nitrate solution.
Users can obtain filters through a network of 600 retail centers throughout the (Cambodian) provinces and the direct sales network.
Hydrologic can also arrange to export Tunsai water filters to countries around the world. To date, Hydrologic have exported to resellers in Yemen, Sri Lanka and Vietnam.
Tunsai Ceramic Water Purifier consist of a porous 10 L ceramic filtering element that suspends in a food-grade, pigment-free plastic receptacle that stores and dispenses filtered water. Filter membrane weighs: 4.6 kg; Flow rate is 2-3 L/hr when full.
To rejuvenate flow rate when filters clog, users scrub ceramic filtering element with a brush. Instructions provided with the unit.
Available locally: Tap for dispensing water, safe storage container, ceramic filtering element.
The average service life of a filter in day-to-day use has been measured as two years. The plastic receptacle and spigot last for five years. Lifespan depends on the quality of the input water and the care taken to avoid breakage.
4 log reduction in bacteria, 2-3 liter per hour flow rate.
WaterSHED laboratory in Phnom Penh
Do not use turbid water as it may clog the product
Pre-filter for very turbid water (>5 NTU)
How often/when should maintenance be performed?
Brown et al., Sustained use of a household-scale water filtration device in rural Cambodia, Journal of Water and Health, 2009.
M. Roberts Field test of a silver-impregnated ceramic water filter, 30th WEDC International Conference, Vientiane, Lao PDR, 2004.
None referenced by the manufacturer.
Known requirements, NSF Protocol P231 established minimum requirements for health and sanitation characteristics of microbiological water purifiers. The requirements are based on the recommendations of the U.S. Environmental Protection Agency’s Task Force Report, Guide Standard and Protocol for Testing Microbiological Water Purifiers (1987) (Annex B).
Summary of evaluation methods including laboratory and field testing.
This filter cannot remove arsenic, or other chemical contaminants from water. As a result, this is not a good device for arsenic contaminated well water (it is best used in Cambodia for rain and surface water.)
More information on awards and work progress
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