Ceramic filter
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.
Evaluations indicate that CSP filters remove turbidity and harmful bacteria that cause diarrhoea, cholera and other waterborne diseases.
| Advantages | Disadvantages |
|---|---|
| Bigger capacity, easier to produce locally and safer than candle filters. |
Contents
Capacity
10-20 litres/day. If filled twice a day the filter produces enough for a family of six.
Maintenance
Cleaning with a brush and changing the ceramic element every 2-3 years.
Costs
Complete filter (off-factory): US$ 8 in Cambodia US$ 10-15 in Nicaragua. Field studies have shown that investment in a filter is "paid back" within 3 to 6 months because of savings on expenses for medicines, fuel wood and labour.
Applying conditions
- 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
Examples and initiatives
150,000 filters are used in Central America, Asia and Africa.
CARE, UNICEF, Red Cross amongst others use the filter.
In Nicaragua, Guatemala and Cambodia the production of this filter is a commercial activity and production is starting up in six other countries.
Production manual
s189535770.onlinehome.us/pottersforpeace/?page_id=125
