My Axis water pump went out on a trip and the shop that fixed it gave me a hand full of of plastic shavings created by drilling the input and output holes. The shavings were just left in the tank. They got into the pump and it quit, sending the water all over the floor. I had month old water in the fresh tank and wanted to put more in the grey so I could dump and clean after the black dump.
I suggest that the owner drain the house water through the floor drain rather than through the pump. The plastic debris will float so the tank has to be empty for it to get into the pump.
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