Slow sand filtration is a filtration system for relatively small scale waterworks. Since it is cheaper to install and maintain than rapid sand filtration which is current mainstream in Japan, it can be more suitable for developing countries depending on the conditions.
The Japan International Cooperation Agency (JICA) has produced a multimedia-based learning package “Slow sand filtration: creating clean, safe water” in English and Japanese, consisting of a video and reference materials.
The video (26 min) can be viewed in 6 parts. Parts 1-5 provide background information on large-scale and small-scale application of slow sand filtration technology in Japan. Part 6 is about a JICA project in Sierra Leone.
The reference documents are on an introduction to Ecological Purification System [5.7 MB] (new concept and new name of slow sand filtration) and a report on the Water Supply Management System in Kambia District project [15.6 MB] in Sierra Leone.