CT Filtron are silver enhanced ceramic ‘pot’ water filters for point of use drinking water treatment manufactured in Ghana based on the open source technology promoted by Potters for Peace.
SDG 6: Clean Water and Sanitation
Market Suggested Retail Price
Target Users (Target Impact Group)
Distributors / Implementing Organizations
The International Committee of the Red Cross, UNHCR, International Office Of Migration, GIZ-Integrated Water Resources Management Project; CARE International; Social Fund for Development, ADRA, Partner Aid International.
Direct competitors include Living Water Treatment Systems.
Locally sourced clay and sawdust 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 nanoparticle solution.
Intellectural Property Type
User Provision Model
From local distributor, accredited distributor in Accra or online retailer.
Distributions to Date Status
More than 10,000 units
Type of filter
Ceramic pot filter
Primary material of construction
Clay, sawdust, silver nanoparticles.
There is a potential for silver in filtered water, below secondary guideline values of 0.1 mg/L
Manufacturer-specified flow rate (L/hr)
2-4 Liters per hour when full
Heavy metals and/or arsenic reduction
Maximum recommended influent turbidity level (NTU)
Effluent turbidity levels (NTU)
Scrub filter when flow rate slows.
Manufacturer-specified lifetime volume (L)
Safe water storage integration
The CT Filtron filtering element is made from porous clay that removes particles and bacteria from water. The ceramic filtering element is also treated with silver nanoparticles.
Technical support is left to the users. When filters clog, users must scrub ceramic filtering element with a brush.
Replacement pieces are available through a local CT filtron distributor.
Manufacturer Specified Performance Parameters
Performance targets: removes Guinea Worm, Cholera, E. coli and other common pathogenic bacteria. Bacteria reduction of >2 log and 2-4 liter per hour flow rate (when full).
Vetted Performance Status
Test results from the Water Research Institute of the Council for Scientific and Industrial Research (CSIR) Ghana indicate elimination of Guinea Worm, Cholera, E. coli and other listed bacteria. The results from Dept. Of Microbiology, University of Ghana Medical School indicate that the CT Filtron is effective in removal of pathogenic parasitic protozoa, other macroscopic organisms and debris from water. CT Filtron removed 99.5% of total coliform when measured by membrane filtration.
Complementary Technical Systems
Pre-filter for turbid water (> 5 NTU).
Academic Research and References
“Yemen,” International Committee of the Red Cross, 24-Apr-2023. Available: https://www.icrc.org/en/where-we-work/middle-east/yemen
“UNHCR US,” UNHCR US. Available: https://www.unhcr.org/us/
“IOM Yemen,” Iom.int. Available: https://yemen.iom.int/
giz, “Yemen,” Giz.de, 30-Oct-2023. Available: https://www.giz.de/en/worldwide/369.html
“Yemen,” CARE International. Available: https://www.care-international.org/our-work/where-we-work/yemen
“Social Fund for Development (SFD) – Home page,” Sfd-yemen.org. Available: https://www.sfd-yemen.org/
“ADRA,” ADRA. Available: https://adra.org/
“PartnerAid UK,” Org.uk. Available: https://partneraid.org.uk/
“Goal 6,” Sdgs.un.org. Available: https://sdgs.un.org/goals/goal6
Steppingstonesforafrica.org. Available: https://www.steppingstonesforafrica.org/wp-content/uploads/CT
C. (claire E. H. Y. ). Mattelet, “Household ceramic water filter evaluation using three simple low-cost methods?: membrane filtration, 3M Petrifilm and hydrogen sulfide bacteria in northern region, Ghana,” Massachusetts Institute of Technology, 2006.
“Water Research Institute,” Org.gh. Available: https://wri.csir.org.gh/
“The Council for Scientific & Industrial Research – Home,” CSIR Ghana. Available: http://csir.org.gh/
“Department of Medical Microbiology, UGMS,” Edu.gh. [Online]. Available: https://dmm.ug.edu.gh/
“Theses – Ghana,” Mit.edu. Available: https://web.mit.edu/watsan/docs_theses_ghana.html
Steppingstonesforafrica.org. Available: https://www.steppingstonesforafrica.org/wp-content/uploads/CT%20FILTRON%20BROCHURE.pdf
kwamefilms, “CT Filtron Installation and Cleaning,” 23-Feb-2011. Available: https://vimeo.com/20281061
Compliance with regulations
Field and laboratory evaluations.
The Filtron has won the World Bank Sponsored GDMP Innovation award at local and international levels.