Hello. I have a BestWay 21' above ground pool. I have two separate outtake ports. They are at the same height on the side of the pool. One is for my skimmer one is for an external filter. I have noticed that when I plug the one for my filter my skimmer works much better. Is this something that can be dangerous to my pump or is it still getting the same amount of water flow with just the skimmer suction line working. Thanks