How to clean the fish pump?

I wonder what kind of pump it is. Built-in or external? If it is built-in, it is necessary to cut off the power supply when cleaning, and then take out the pump for cleaning. My experience is that it is best to wrap the pump in a plastic bag so that the filtered stolen goods will not flow into the cylinder. If it is external, it can be cleaned by unplugging the water pipe after power failure. When cleaning, filter materials such as filter cotton need to be taken out and cleaned.