Brazilian-made Filtro Flex by Cerâmica Stéfani is a household silver-impregnated water filter with 6 liters capacity and one or two Stéfani Sterilizing filter candles. The filter candles contain microporous ceramic wall for particles removal, granular activated carbon for chlorine, unpleasant tastes and odor removal, and colloidal silver for disinfection. The Stéfani filter candles are also compatible with all marketed gravity water filters in Brazil and many others worldwide according to the Path C1 Common Interface.
SDG 6: Clean Water and Sanitation
Market Suggested Retail Price
Target Users (Target Impact Group)
Distributors / Implementing Organizations
Online retailers, Brazilian stores, many distributors worldwide
Flex Water Filter is manufactured in Brazil from food-safe plastics. It ships disassembled and the user can follow the video tutorial on how to assemble it.
User Provision Model
Users can purchase Filtro Flex and replacement filter candles in Brazilian homewares stores, or by contacting the manufacturer for the appropriate international distributor.
Distributions to Date Status
6.2 million Stéfani Sterilizing filter cartridges and 170,000 Flex Water Filter units have been sold since 2010. Interview with Representative
Type of filter
Ceramic candle filter
Primary material of construction
Ceramic with colloidal silver
Manufacturer-specified flow rate (L/hr)
0.5 – 3 liters
Heavy metals and/or arsenic reduction
Maximum recommended influent turbidity level (NTU)
Effluent turbidity levels (NTU)
0 NTU. The Stéfani filter cartridges remove all particles between ? 5 up to < 15 ?m.
Clean filter candles with water and a scrub pad when flow is reduced
Manufacturer-specified lifetime volume (L)
Safe water storage integration
The Stéfani Filtro Flex weighs 1 kg and is 46 cm tall by 24 cm in diameter. It has a capacity of 8L of safe water storage and consists of one or two filter candles with float valves for greater capacity.
Video tutorials in English and Portuguese are available to assist users in assembling the new filter when it is unpacked and for cleaning and replacement of the filter cartridges.
Users can purchase replacement Stéfani filter cartridges for around $4 or from housewares stores.
The filter candles must be replaced after filtering 500 L each or after 6 months, whichever is sooner. The plastic filter housing can be used for many years with proper cleaning and keeping it out of sunlight.
Manufacturer Specified Performance Parameters
The Stéfani filter cartridges remove all particles between ? 5 up to < 15 ?m, ? 75% of free chlorine (in upgraded Sterilizing filter version), and 2 log reduction of E. coli. All Stéfani filter cartridges meet INMETRO (National Institute of Metrology, Quality and Technology – from Brazil) criteria for chemicals and particulate. Manufacturer provided documentation: Características dos filtros Stéfani - Inglês - 21-08-2017
Vetted Performance Status
The Cerâmica Stéfani water filters are certified by the regulatory agency of the government of Brazil, NMETRO to provide clean drinking water.
No known safety risks.
Complementary Technical Systems
Academic Research and References
Social Adoption of a Non-Conventional Technology for the Treatment of Water in Housing, Vereda El Motilón Pasto (Nariño)
Edwin Alfred Martínez Jaramillo and Nelson Orlando Narvaez Mora (2017)
Comparative Study of Homemade Filtration Systems for the Treatment of Safe Drinking Water
Andrea Pérez Vidal, Jaime Díaz Gómez, Ginna Paola González Rojas (2014)
Compliance with regulations
The Cerâmica Stéfani water filters are certified by the regulatory agency of the government of Brazil, INMETRO to provide clean drinking water.