Ceramic Pot Filter
A fired-clay pot, often silver-coated, that filters household water by gravity.
What is it?
A ceramic pot filter is a porous fired-clay vessel, frequently impregnated with colloidal silver, that sits inside a receptacle. Water poured in filters slowly through the clay into safe storage.
Why does it matter?
It can be produced locally from clay, sawdust, and simple kilns, creating local livelihoods while delivering a low-cost household treatment option.
How does it work?
Micropores in the fired clay physically block bacteria and protozoa; the silver coating adds an antibacterial effect that limits regrowth on the filter surface.
Who benefits?
Households needing an affordable, locally repairable filter, and local artisans who manufacture and sell them.
Who may be disadvantaged?
Users relying on the filter for virus removal may be under-protected — ceramic pores remove bacteria and protozoa well but viruses less reliably.
What evidence exists?
Field trials of ceramic filters report reduced diarrhoeal disease and improved microbiological water quality when filters are used consistently.
What tradeoffs exist?
Low flow rate (1–3 L/hour) and fragility are real limits; a cracked filter fails silently. Quality control in manufacturing strongly affects performance.
Common misconceptions
Silver coating does not make water “sterile,” and a filter that looks intact can still be cracked or clogged; regular inspection matters.
What you can do next
Contrast with the biosand filter, and review the metric node on diarrhoeal-disease reduction to see expected impact.