02-08-2010, 09:50 PM
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not taking into consideration friction loss from the water passing through the hose, it only takes ABOUT 10 psi to travel 10 feet vertically, which is the average height of the 2nd story in relation to the first. SO in order for the water to reach the 2nd floor it needs an absolute minimum of 10 psi. the AVERAGE water supply just about anywhere, and again, average, is 50-70 psi, considering that alot of us are on private well systems, which will have less pressure normally than municipal water sources.
short story, wisfish is absolutely correct. as long as you have a way to gate the water flow FROM the tank to the downstairs sink to control the suction.
im not sure if the suction from the python is pure syphon or forced venturi, but tank downstairs and sink upstairs might not work if the venturi cant supply enough suction to overcome the gravity. it would be worth an experiment though :)