I bought a grandfar pump with a guarantee! Two days of work and the pump started working intermittently , I brought it to the service and was stunned , they say , knock it on the anchor from behind or turn it manually and it will work , this is the norm for these pumps ! I've seen this company in my grave. If you need a pump, then in no case do not take this company! And if you bought it, now you know the additional actions that are not in the instructions, but must be prescribed because the pump does not work in any other way!