| http://www.w3.org/ns/prov#value | - In practice, however, due to the amount of suction generated by using device 10 in the manner described below to draw water through pre-filter 26 into holding chamber 12, pre-filter 26 may have a very small pore size such as thirty-five microns or smaller and still allow water to be easily drawn through such pre-filter into holding chamber 12, so that pre-filter 26 prevents both large and small co
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