When pool water flows through the recirculation system, resistance to that flow is created in the pipes, the valves, the fittings, the pool filter and basically anything in the flow path. That resistance is called Total Dynamic Head, TDH, and it has a large impact on determining the size of your pool pump and filter. Your pool's TDH was estimated when your pool was first installed. This guide shows you how to accurately measure the TDH of an existing pool system to verify that your pool pump and filter are correctly configured.
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