Our pool installer told us that when we vacuum, we close the the skimmer that doesn't get the vacuum hooked up almost completely to add more suction to the skimmer where we vacuum from. Also, I've noticed that we have to play with how much we close that same skimmer to make sure the other skimmer actually pulls debris in...make sense.
But, after re-opening the pool this year, it seems that the skimmer farthest from our pump (the same one we vacuum out of) barely even has any suction any more. It doesn't matter how much we adjust the other skimmer, it just doesn't seem to pull like it used to. Any ideas or suggestions? Could it be the pump? I am looking to replace it anyway.