Tunsai (Rabbit) Ceramic Water Purifier
The Tunsai (Rabbit) Ceramic Water Purifier is a gravity-fed silver enhanced ceramic water treatment solution.
Cambodia and exported in Yemen, Srilanka, and Vietnam.
Distributions are mostly carried out through NGO channels and a network of retailers. Hydrologic also distributes the product when it is acquired as a direct sale from a Micro-Finance Institution (MFI).
Two models are produced by Hydrologic, the ‘Tunsai’ (Rabbit) which retails for about 13.50 USD, and the ‘Super Tunsai’ which retails for 39 USD.
Users can apply for a loan from Hydrologic’s Micro-Finance Institution (MFI) partners to acquire the Super Tunsai, with a 2.8% per month interest over a 6 to 12 month period.
Primary competitors include products available in the local markets like Resource Development International – Cambodia (RDIC). However, secondary market competitors outside the region include Silver filter, Ekofil filter, Ceramic filter UTP, Arcifiltro, Ecofiltro or ceramic candle filters such as Stefani filtro flex.
Goal 6: Clean water and sanitation
Individuals and households
The product is locally manufactured in bulk. The materials are also sourced locally. First clay and rice husk are processed and mixed with water, then the resulting mix is pressed into the filter shape and fired to a ceramic state. The ceramic product’s flow rate is tested to ensure product consistency. Finally, the product is coated with a silver nitrate solution to prevent microbiological growth within the filter and increase bacterial removal efficacy.
Users can obtain filters through a network of 600 retail centers throughout Cambodian provinces and the direct sales network, as a donation from an NGO channel or by applying to a loan from Hydrologic’s Micro-Finance Institution (MFI) partners.
Hydrologic also exports the Tunsai water filters to other countries around the world. To date, Hydrologic have exported to resellers in Yemen, Sri Lanka, and Vietnam.
As of 2020, over 450,000 units have been sold.
Description of the type of ceramic filter (pot, candle, or disk)
What primary material is used (ceramic, mud, clay etc.)?
Additional materials added to improve disinfection
Manufacturer-specified flow rate (L/hr)
Laboratory-evaluated log scale removal rate of bacteria
Laboratory-evaluated log scale removal rate of viruses
Laboratory-evaluated log scale removal rate of protozoa
Reduction levels of heavy metals and/or arsenic through this treatment system
Manufacturer-specified maximum level of inlet turbidity (NTU)
Range or value of outlet turbidity levels (NTU)
How often/when should maintenance be performed?
What is the total number of liters that is recommended can be filtered?
Is there safe water storage integrated into this product?
Tunsai Ceramic Water Purifier consists of a porous 10 L ceramic filtering element that suspends in a food-grade, a pigment-free plastic receptacle that stores and dispenses filtered water.
- The filter membrane weighs 4.6 kg.
- The flow rate is 2-3 L/hr when full.
There is no technical support provided and users are expected to maintain the product on their own by scrubbing ceramic filter element with a brush.
Replaceable components include the tap for dispensing water, safe storage containers, and ceramic filtering elements.
The average service life of a filter in day-to-day use has been measured as 2 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.
This filter was designed to remove bacteria by 99.99% and have a flow rate of 2-3 liter per hour. Designer specifies this product is a scientifically proven technology that is tested quarterly by a certified laboratory with international standards; is a fast, cheap and easy drinking water solution; and is trusted by more than 100,000 families in Cambodia.
Testing performed by WaterSHED confirmed effectiveness in supplying water with less than 10 E. coli bacteria per 100 mL.
WaterSHED laboratory in Phnom Penh.
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).
Brown, J et al., 2009, Sustained use of a household-scale water filtration device in rural Cambodia, Journal of water and health, 7(3), pp.404-412.
Roberts, M., 2004, Field test of a silver-impregnated ceramic water filter. In People-Centred Approaches to Water and Environmental Sanitation,30th WEDC International Conference, Vientiane, Lao PDR (pp. 499-504).
Van et al ., 2007, Ceramic silver-impregnated pot filters for household drinking water treatment in developing countries: material characterization and performance study, Water science and technology: Water Supply, 7(5-6), pp.9-17.
Schaefer et., 2018, Arsenic leaching from ceramic water filters, Environmental Science: Water Research & Technology, 4(2), pp.234-240.
The product is evaluated for removal of turbidity and bacteria in a certified laboratory established by the UN named WasterSHED.
In context photographs (0)
You can use the form below to contribute a photo of this product.
In context files & documents (0)
Feedback from users, customers & distributors
Please let us know your experience in using this product through comments below.