TATA Swach Cristella Plus Water Purifier
TATA Research, Development & Design Centre & Tata Chemicals
A low-cost water purifier for households in India.
The TATA Swach Cristella Plus is a household water purifier which uses the Silver Nano-Technology to remove bacteria and viruses from 1 L at a time.
Some competitors include: Sujal, priced at $2.36 with replaceable filter bed at $0.40; Kent Gold UF Membrane Filter priced at Rs. $125 – $141.40 USD; Hindustan Lever PureIt (battery operated); Eureka Forbes AquaSure Amrit
Goal 6: Clean water and sanitation
TATA suggests this product is targeting poor or disaster effected customers in India.
IP Protected (Patent Unknown)
Online retail and via local distributors throughout India. Claim to have 30,000 consumers in 36 markets.
30,000 units are said to be have been distributed/sold (As of 2012)
How often/when should maintenance be performed?
The TATA Swach filter is comprised of two parts. The upper portion contains reservoir where the untreated water enters and the lower portion has the TATA Swach Bulb to which the cartridge can be attached. The TATA Swach bulb is densely compacted with processed rice husk ash impregnated with activated silica coated with silver nanoparticles. Another reservoir is placed at the lower end, which collects the filtered water. The system is gravity fed and does not require electricity or constant flow of water. The upper chamber can be easily cleaned. Depending on the quality of water, about 3000 litres can be filtered after which the cartridge can be replaced. Once purifying capacity is exhausted the Swach bulb fuses and prevents water from passing. Both the upper and lower storage containers have a maximum capacity of 9 litres each. The flow rate of the filter is 3-4 litres per hour.
According to the manual, technical support is available by phone 1-800-258-5858 and online. Minimal training required. TATA also provides a manual for operations and maintenance.
The Bulb must be replaced at the end of its life and may be purchased online. The following components are available at local retailers: Top Mesh, Top Container, Bottom Container, Tap, Adapter, Bottom Mesh.
3,000 L. No warranty or disposal information given.
Purifies 3-4 L/hr, but could be slower/faster depending on quality of input water. The Tata Swach bulb has a capacity to purify up to 3000 litres of drinking water. The TATA Swach bulb meets the LRV norms as per USEPA guidelines, log 4 reduction in bacteria and virus. The product has been tested at laboratories at a temperature of 25+/- 2 deg cel, in moderate humidity conditions. Ideally put normal drinking water such as municipal water or drinkable water from wells and borewells into the device to enjoy the best performance of TATA Swach.
The Department of Consumer Affairs (DCA), Ministry of Consumer Affairs, Food & Public Distribution, Government of India conducted comparative testing (CT) of 10 popular brands of non-electric storage water purifiers in India in 2014 which included the TATA Swatch. Some key tests were conducted as per the guidelines based on relevant Bureau of Indian Standards. According to their findings the TATA Swatch was unable to reduce E. coli up to 100 per cent when tested at different intervals. It was able to reduce MS2 virus between 90- 99.99%.
The Comprehensive Initiative on Technology Evaluation (CITE) at MIT evaluated household water filters available on the market in Ahmedabad, India in summer 2014. Their testing indicated that the TATA Swach Cristella Plus was unable to remove higher than 95% turbidity throughout the lifetime of the filter. Full findings are available in this report.
Department of Consumer Affairs (DCA), Ministry of Consumer Affairs, Food & Public Distribution, Government of India • Central Food Technological Resarch Institute (CFTRI), Mysore RD Analytical, UK • Haffekine, Mumbai Microtech Services, UK • IADFAC, Bangalore AES, UK • Serum Institute, Mumbai Vitens, Netherlands • Intertek Labs, Mumbai
Safe water storage containers
He, D., et al., Synthesis and Characterization of Antibacterial Silver Nanoparticle-Impregnated Rice Husks and Rice Husk Ash, Environ. Sci. Technol., 2013, 47 (10), pp 5276–5284.
In India there are no standard for water filters. TATA Chemicals claims that the TATA Swach Bulb complies with the US Environmental Protection Agency (EPA) standards. Specifically, US EPA National Primary Drinking Water Regulations (NPDWRs or primary standards). However documentation to this effect has not been publicly disclosed.
The Bureau of Indian Standards has laid down specifications for ceramic water filter candles for drinking water via IS: 7402 – 1986 (amended from time to time). These filters remove suspended matters and bacteria but are not expected to filter dissolved solids or chemicals. Note that interpretation of results is based on IS: 10500 specification for drinking water.
The Department of Consumer Affairs (DCA), Ministry of Consumer Affairs, Food & Public Distribution, Government of India conducted comparative testing (CT) of 10 popular brands of non-electric storage water purifiers in India in 2014 which included the Tata Swatch. Some key tests were conducted as per the guidelines based on relevant Bureau of Indian Standards. CITE at MIT employed a variety of methods to collect data for the water filter evaluation including lab and field tests of the water filter performance; surveys of water filter retailers and households in Ahmedabad; and semistructured interviews with original equipment manufacturers and distributors in Ahmedabad and Gandhinagar.
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