Biosand Filter Components
Most biosand filters consist of similar components. At the top of the filter there is a tightly fitted lid, which prevents contamination and unwanted pests from entering the filter. Below is the diffuser plate, which prevents disturbance of the filtration sand layer and protects the biolayer when water is poured into the filter. Next, is the filtration sand layer. It removes pathogens and suspended solids. Below the sand is a layer of smaller gravels called the separating gravel layer. This prevents filtration sand from entering the drainage gravel layer and clogging the outlet tube. Right below this separating layer is the drainage gravel layer, which supports the separating gravel layer and helps water flow by preventing clogging near the base of the outlet tube.
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“Hence, a generative grammar must be a system of rules that can iterate to generate an indefinitely large number of structures. This system of rules can be analyzed into the three major components of a generative grammar: the syntactic, phonological, and semantic components.”
—Noam Chomsky (b. 1928)