The pump stopped working in 3 months. I checked the adaptor for output voltage and the pump for continuity, they both are OK. Then I disassembled the pump, cleaned the deposits with a toothbrush, and the calk (on the rotor) with the backside of the knife. Assembled the pump in reverse order. The cats are happy and I hope you too, dear viewer because you can do it for 15 min!

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