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    Will It Damage My 2nd BackUP Heater If I Run It Without A Filter

    Greetings. Hope someone can help. I have just completed a pool remodel. My primary Heater is a RayPak Gas Heater with a Pentair Variable Speed 2 hp pump. It circulates the water thru a large Pentair filter. I have a 2nd heater, a RayPak Heat Pump R8350 running thru a Pentair 2hp Wisper Flo pump...