I my Intellichlor manual, it recommends having a check valve between the input side of the IntelliChlor cell and the heater output pipe to prevent high concentrations of chlorine entering the heater when the pump shuts off. There is a similar recommendation in my MasterTemp heater manual. My PB did not install a check valve. Is this something I should consider doing, or is it not that necessary?
TIA
TIA