Solvatten Solar Safe Water System
A water purifier and heater aimed to reduce a household’s dependency on heating water over a fire.
Solvatten® is a combined portable water treatment and solar water heater system that has been designed for use at the household level. It is designed to insulate and also store heated water. This Solar Techonology reduces the need to heat and boil water by burning firewood or charcoal therefore tackles climate change by reducing carbon emissions in average 1,5 tonnes/ year and 10 tonnes per lifetime use. It is also designed withthe purpose of reducing expenses for the urban poor and so improving lives inKenya’s urban slums.
This product is designed and produced by Solvatten, a Swedish social enterprise with base in Stockholm.
Countries where Solvatten has been deployed include: Kenya, Uganda, Tanzania, Peru, Brazil, Mexico, Haiti, China, India, Afghanistan, East Timor, Papau New Ginea, Angola, South Africa, Mali, Benin, Congo, Ethiopia, Senegal
Solvatten is currently active in 45 different projects with various international partners and NGOs.
Collaborators and partners include: PLAN International, International Aid Services, UNICEF, NRC, SOS Children’s Villages,
UNFCCC, OXFAM, UN Habitat, WWF, SIDA, EXPORT RÅDET, AMREF, Child Fund, ALMI,LIONs Sweden, SLU, KTH, Uppsala University VINNOVA, WHO, VI Agroforestry, IVL, My climate, IEW Kenya, Ministry of Environment Haiti, Kopernik, Svenska Kyrkan, LWF, Tillväxtverket, PhilMedAlliance, Impact Carbon, U&We, CHAIN Uganda, ECO ARKI Peru, Urban Way, RINCOD, Rotary and many more.
Quoted pricing based on purchasing volume from Solvatten directly.
Via Kopernik: 5000 USD for 42 units
Goal 6: Clean water and sanitation
Mass produced. Solvatten® is manufactured in Sweden in compliance with ISO 14001 and ISO/TS 16949 (Environmental and Quality certifed).
Registered trademark and patented product of Solvatten AB Sweden. The Solvatten® unit and the indicator are protected under a number of patent registrations which include Sweden, China, India, US, EPO, PCT.
Solvatten® is available for purchase online. For purchasing larger quantities for projects in developing countries, it is recommended to contact the sales team directly.
Today, Solvatten® is used in more than 20 countries around the world reaching more than 260,000 people.
List of the methods used for purification
Manufacturer-specified water treatment rate, measured in liters per hour
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)
Is there safe water storage integrated into this product?
What is the total number of liters that is recommended can be filtered?
List consumables of this product (power, filters, etc.)
Solvatten® is a portable 10 liter container that utilizes solar energy to heat and treat water at the household level. The unit does not require chemicals, spare parts or other supplies. Solvatten® works by incorporating three established methods for treating water; • Filtration: water is poured in through a hole housing a fabric filter that catches larger particles. • Heat pasteurization: heat from the sun warms up the water, killing pathogenic material. • UV-disinfection: The high energy associated with UV sunlight causes damage to the DNA of micro-organisms, rendering them unable to reproduce or infect. Users must expose the Solvatten to 2-6 hours of direct sunlight to achieve water that is treated within the ‘Highly protective’ category defined by Swedish Cleantech.
Under optimal conditions Solvatten can be used four times a day and treat up to 40 Litres of water per day. The unit does not work effectively during heavy cloud cover or rain. The SVI-10 indicator shows when the water is safe. In addition to safe water, Solvatten heats water to up to 75°C for household and hygiene purposes, such as cooking, hand washing, bathing and domestic cleaning.
The Solvatten dimensions are 360 x 470 x 130 mm and it weighs 2.70 kg unfilled.
Solvatten® provides guidance related to operation via graphic instructions that are printed on the unit. To date they have printed instructions in English, Spanish, French, Portuguese, Urdu, Hindi and Swahili. Technical assistance services are not indicated.
On average, a Solvatten® unit lasts seven years, but if handled with care it can last much longer. If a family uses Solvatten for seven years, treating 20 liters of water for 330 days a year, they will produce 46,200 Liters of safe water.
The unit includes a 1 year full warranty against manufacturing defects, on condition the customer has followed the use and care instructions provided.
Under optimal conditions Solvatten® can be used four times a day and treat up to 40 Litres of water per day. Solvatten heats water to up to 75°C for household and hygiene purposes. Safe, warm water is achieved in 2-4 hours, when the sun is shining, 5-6 hours when it is partly cloudy.
Solvatten® has been tested using samples containing more than 200,000 colonies/100 ml – the results of this test showed that the treated water met the WHO’s safe drinking water standards of less than 1 colony/ 100ml. Solvatten® can treat highly resistant forms of bacteria, viruses and parasites. USEPA certified tests conducted in California in 2014 showed that water treated by Solvatten® reached the ‘Highly protective’ category, eliminating parasites, virus and E-coli. By comparison, chlorine and most filters are not able to achieve this level of protection.
Laboratory testing against E. coli, faecal coliforms, faecal Streptococci and total coliforms conducted by Water Quality Laboratory Gaborone, Botswana. Department of Water Affairs (2013) showed acceptable water quality for human consumption.
Improper use of Solvatten® is a risk of exposure to harmful microorganisms and increase your risk of gastrointestinal illness. Never use Solvatten® to filter seawater or chemical contaminated water, including water from mining tailing ponds or from near large agricultural operations.
The efectiveness of Solvatten® may be limited by environmental or hygiene conditions that could contribute to the recontamination of water after it has been treated according to the instructions. These conditions include but are not limited to: • Using water from
Solvatten® with dirty and bacterial contaminated hands. • Storage of treated water in contaminated containers. • Treatment of water with high turbidity (> 40NTU) without pre-fltering the water. By using Solvatten®, you tacitly accept and agree to the term and conditions of the user instructions and the Disclaimer (1.2) 2016.
Solvatten® recommends cleaning inside periodically, so that it continues working efficiently by simply adding a handful of dry beans, rice or lentils and some water to the unit, before shaking and rinsing. Soft woolen balls are another alternative here. Do not use sand, as it may scratch the surface, and do not use detergents.
Solvatten® is manufactured in compliance with ISO 14001 and ISO/TS 16949 (Environmental and Quality certifed). Environmental Footprint Reference: LCA Master Thesis by KTH/ The Royal Swedish Technical University 2011.
Lundström H & Hagström E, 2012, A field study in Kenya of isolation parameters to make water drinkable in the household water treatment unit Solvatten. Uppsala University, Uppsala. not peer reviewed
Jönsson, J., Wikman, A., and Wätthammar, T., 2011, Social Return on Investment, SROI, the value added for families before and after using Solvatten in the Bungoma district in Western Kenya, First cycle, G2E. Uppsala: SLU, Dept. of Economics.
Isberg, U., and Nilsson, K., 2011, Life Cycle Assessment and Sustainability Aspects of Solvatten, a Water Cleaning Device, dissertation, KTH, School of Architecture and the Built Environment (ABE).
• Laboratory assessment conducted by Biovir Laboratories for virus, bacteria and Cryptosporidium reduction in two challenge waters.(2014)
• Laboratory testing against E-coli, faecal coliforms, faecal Streptococci and total coliforms. Conducted by Water Quality Laboratory Gaborone, Botswana. Department of Water Affairs (2013)
• Field trials were conducted by UN-habitat (2008) to assessing the effectiveness of Solvatten in Kathmandu, Nepal
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