My husband and I just bought a house with a 13,000 gallon pool. We have no idea how to take care of it. I just replaced the filter and am trying to find out why the Jandy Actuator is making a sucking noise when I have the knob turned towards the middle. I was told at Pinch-a-penny that I could turn the knob one way for the skimmer and one way for the bottom drain. When it is in the middle it should operate both drains. It makes a much different sound when it is in the middle than on either of the two sides. Is this normal or is it a problem? I don't want to burn the motor or something. Thanks for any insight or helpful videos.