I am interested in the Liquidator, but not sure it will work without a modification of my plumbing. My pump sits directly below the skimmer with a 2" pvc pipe between them. The straight down drop is about 30". I don't understand the physics, but I have read that there needs to be resistance between the skimmer and the pump for the liquidator to work. Is this correct and how do I know whether the Liquidator will work with my plumbing? TIA