Abstract
Percolating filters provide easily accessible, rewarding sites for ecological fieldwork, within the scope of GCE A-level syllabuses. The use of percolating filters reduces problems of organization, avoids damage to habitats, and provides a local study site which can be used for fieldwork or the rapid collection of biological material throughout the year. The component species are easily identified and the habitat can be studied as a simple or complex system. Meaningful data, both micro and macroscopic, can be easily collected to study species interactions.
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