In addition to a vacuum pump, you can also siphon the water out, especially with an above-ground pool. If you are draining a spa or just need to clear out the last few inches in a pool, a wet/dry ...

The Pittsburgh Automotive 2.5 CFM Vacuum Pump is the most affordable of the bunch at $99.99, while the brand's 3 CFM Two Stage Vacuum Pump is the most expensive, costing $139.99.

With this approach, mass spectrometers fitted with miniaturized vacuum pumps could be easily produced and deployed in remote regions – allowing small communities in developing countries to analyse ...