[[Image:CSP filter.jpg|thumb|right|250px|Family using a CSP filter (Ceramic Silver impregnated Pot model)filter in Zapatera, Nicaragua. Photo: NWP.]]
A new alternative to conventional ceramic candle filters is the CSP filter.This model has a pot-shaped ceramic filtering element that is treated with colloidal silver. It has a bigger capacity and is easier to produce locally than candle filters. Also leakages are easier to detect than in candle filters so there is less risk in use.
“A filter for family use that provides clean and bacteria-free water at a cost of US$ 3-5 per family per year” - Ron Rivera of the NGO Potters for Peace.
==Suitable conditions==
==Construction, operations and maintenance==
Capacity: 10-20 litres/day.
==Costs==
Cost complete filter:
(off-factory): US$ 8 in Cambodia, US$ 10-15 in Nicaragua.<br>
Cost of introduction: US$ 15,000 - 30,000 for project incl. training, machinery and a first production of 500 filters.
US$ 50,000 - 100,000 for project incl. production shop, training, first promotion, and 5,000 filters.
==Field experiences==
150,000 in Central America, Asia and Africa.
==Acknowledgements==