Remove the rear motor cover, you will need pliers and a 7/16 open end wrench. The opposite end of the impeller has a shaft that has to be secured by the wrench. The shaft has a notch on each side, it could be behind the two small springs that hold the spinning connection. There is a bigger shaft version that needs just a small end cap taken off and that will expose the shaft to be held and that is a bigger wrench. Once the shaft is secured, you may need pliers to turn off the impeller. Turn counter clockwise. Remember to be careful, it's plastic and well used. Don't forget the seals to put it back together.
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Remove the rear motor cover, you will need pliers and a 7/16 open end wrench. The opposite end of the impeller has a shaft that has to be secured by the wrench. The shaft has a notch on each side, it could be behind the two small springs that hold the spinning connection. There is a bigger shaft version that needs just a small end cap taken off and that will expose the shaft to be held and that is a bigger wrench. Once the shaft is secured, you may need pliers to turn off the impeller. Turn counter clockwise. Remember to be careful, it's plastic and well used. Don't forget the seals to put it back together.