Hence the relatively small projected sea level rise by the year 2100, as compared to the changes measured in tens of meters that occurred in Earth's history (see Introduction). The rise by 2100 is only a small beginning of a much larger, multi-century response of ocean and ice sheets to elevated global temperatures.
Single Speed Pool Pumps: Runs at a single speed, 3450 rpm (revolutions per minute). Imagine if your car ran at 3450 rpm - all the time, and how much gas you would use! Dual Speed Pool Pumps: Have a fourth wire coming into the pump, the low speed wire. This allows you to run the pump on low speed for 8-16 hrs per day, and high speed for 4-8 hrs. Variable Speed Pool Pumps: Operates at many speeds, programmable and self-optimizing for the highest energy efficiency and greatest energy savings.
Traditional pool pumps often burn 1800 - 2500 watts. The wildly inefficient valves found on sand and DE filters may increase power consumption further, up to another 300 watts. Inefficient booster pumps used to power automatic pool cleaners consume another 1400 - 1600 watts. Salt water chlorinators can burn another 400 - 500 watts. Last but not least, a typical pool light requires up to 500 watts. When all equipment is running, a pool can use the same energy as fifty 100 watt light bulbs.