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I'd be willing to bet it's the main drain but it's odd that they don't have valves on both lines. It's nice to be able to shut off the skimmer if you want to drain the pool for some reason. I can say I absolutely hate those stupid gate valves. I had those on my main drain, spa drain and...

It really depends on the filter and system downstream. If you haven't already backwashed it, then do that. When you start it back in the filter mode make a note of the pressure on the gauge, this will be the "normal" pressure. Backwash when filter pressure rises 10psi over the starting pressure.