I installed a 3-way valve to bypass the pool heater while in service and connected the pool heater outlet to a FLOWVIS/check valve before a tee returning to the SWG/pool. If the pump runs at higher than 1500 RPM, the the FLOWVIS leaks a lot (from the backflow, not from top seal). Granted, that with the normal water flow direction, the FLOWVIS should not get any back water at high velocity, however, I now have some doubts on how reliable these meters could be trusted as a check valve. Is this to be expected?
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