I have an inground where the bottom drain feeds into the bottom of the skimmer bucket and then combines with skimmer water to a single line to the pump. Sadly, this gives me no control over bottom vs skimmer. I was curious to see how well the bottom drain worked, so I covered the pool-side of the skimmer intake with the skimmer cover (worked better than I expected). Also unexpected: the pump ran dry, even with standing water in the skimmer bucket. I'm not sure how that's possible, but my question is should I expect the bottom drain to be able to feed enough water by itself, or does the pump running dry imply a blockage in the bottom drain? When the pool company winterized the pool last fall, I watched them blow out the bottom drain line without issue.