riksvsreward
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Just bought a 1960's house. It has a Grundfos UP 15-18 recirculation pump in the line. Notice when I run hot water in any of the tubs, little particles of grease float to the top of the water. When I unplug the pump, no grease. When I bought the house, the main water line was turned off and the pump was plugged in (which I heard is not generally a good idea). Is it possible that the pump broke and is leaking grease into the hot water line or is there another explanation. Any help greatly appreciated. I did drain the water heater a few times prior to discovering the link to the recirculation pump.