Tunsai (Rabbit) Ceramic Water Purifier
Tunsai Ceramic Water Purifier are silver enhanced ceramic ‘pot’ water filters for household drinking water treatment manufactured in Cambodia based on the open source technology promoted by Potters for Peace.
Distribution is through NGO channels and through a network of retailers.
Two models are produced by Hydrologic, the ‘Tunsai’ (rabbit) which retails for about US$13.50 and the ‘Super Tunsai’ which retails for US$23.50. US$1 = 4,000 Cambodian riel (March 2011). For village sales, VisionFund loans for water filters are charged at 2.8% per month for 6 months, and the VisionFund agent visits each month to collect payments.
Household water treatment methods and products available in local market, including Resource Development International – Cambodia (RDIC) and Engineers Without Borders Australia (EWB Australia) – RDIC Ceramic Water Filter
Targeted at Cambodian households without access to potable water, earning between US$1-$5 per person per day.
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. Sales averaged about 26,000 per year from 2006 to 2010, but increased to nearly 47,000 in 2011 with the new factory working near full capacity (4,000 pots per month) and the launch of the Super Tunsai and the direct sales network
Village-to-village water filter sales. Hydrologic recruits and trains commissioned sales agents, each of whom coordinates with village chiefs to arrange group sales meetings in about 20 villages per month.
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.
How often/when should maintenance be performed?
Tunsai Ceramic Water Purifier consist of a porous 10 L capacity 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 2.5 – 4.5 litre/hour when full.
To rejuvenate flow rate when filters clog, users scrub ceramic filtering element with a brush. Instructions provided with the unit.
Available in country: 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.
Filtered water tested by the Ministry of Health and meets World Health Organization guidelines for clean drinking water. Laboratory tests confirm effectiveness in supplying water with less than 10 E.coli bacteria per 100 ml
WaterSHED laboratory in Phnom Penh
Pre-filter or settle very turbid water (> 5NTU)
Joe Brown Study that looks at all ceramic Water In Cambodia and Sustained use of a household-scale water filtration device in rural Cambodia Joe Brown, S. Proum and M. D. Sobsey; Field test of a silver-impregnated ceramic water filter, M.
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).
United States Environmental Protection Agency Methods 1602 (EPA 2001) and 1622(EPA 2005)(“Implementer feedback: Rachel Pringle – Implementer – iDE Cambodia”)
21st edition of Standard Methods for the Examination of Water and Wastewater (American Public Health Association [APHA], American Water Works Association [AWWA], & Water Environment Federation [WEF] 2005) ^2
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.) Not time efficient for purifying large quantities of water. Ashden Award winner 2012
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