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[QUOTE="TARM, post: 1420862, member: 578"] I think its because most people do not deal with plumping etc dealing with fluids etc. With our SD if the pump is in the same place and orientation then there is no difference in the level of the hose outlet in reference to the tank level whether its a siphon or a bottom sump. Not only that but the understanding science of siphon performance has actually been contested and not fully understood for a very long time. It use to be thought it was the change in pressures but then it was shown that it could work in the vacuum. Then it was thought to be molecular cohesion but then that did not hold up to why siphons still worked with air bubbles and CO2. It seems its likley a combo of these that effect it depending on the conditions. For our use we have a "practical siphon" The wiki has a good statement if its action: [url]https://en.wikipedia.org/wiki/Siphon[/url] "A practical siphon, operating at typical atmospheric pressures and tube heights, works because gravity pulling down on the taller column of liquid leaves reduced pressure at the top of the siphon (formally, hydrostatic pressure when the liquid is not moving). This reduced pressure at the top means gravity pulling down on the shorter column of liquid is not sufficient to keep the liquid stationary against the atmospheric pressure pushing it up into the reduced pressure zone at the top of the siphon. So the liquid flows from the higher pressure area of the upper reservoir, up to the lower pressure zone at the top of the siphon, over the top, and then with the help of gravity and a taller column of liquid, down to the higher pressure zone at the exit" [/QUOTE]
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