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The filter piping arrangement is as simple as possible to accomplish filtration, backwashing, and filtering-to-waste. Sand filter units designed for performance at high rates of filtration are acceptable for installation at pools of small to moderate size and which are planned to accommodate only light swimmer loading; provided further, that such filter units have been tested and approved by a nationally recognized testing laboratory to function satisfactorily at the rate or rates specified. If a high-rate sand filter unit installed at a swimming pool fails to produce results satisfactory to the department it must be replaced with an adequate and approved filter unit of conventional design.