There's a lot more to draining a pool than meets the eye. Not only are there concerns over proper water disposal, but emptying a pool also puts the structure itself at risk. That's because many pool ...

High vacuum lines and valves should be designed in accordance with the nominal pumping speed of the high vacuum pump. Otherwise, there will be considerable losses in the effective pumping speed due to ...

Equipment: A pump and a tin quart sized can with a screw cap. What it does: The pump is attached to the can and is turned on to evacuate the can. The resulting vacuum crushes the can.