In my pool, I have 2 skimmers, one of which (nearest to the pump) the dual main drain is connected to. In the bottom of this skimmer there are 2 holes, one with suction going to the pump, the other (no detectable pressure/suction) coming from the drain. I just don't see how any circulation is being created in the drain without it being somewhat of a closed system. Is this a "normal" configuration?
Thanks for any insight.