The E500 offers a place to swim, run, workout, and relax all in one place. The E500 measures 15′ long x 89″ wide with jetted seating for 3. For those seeking better overall wellness, including your physical, mental, and emotional states, the E500 may just be the machine that brings it all together. The E500 Combines Endless Pools’ exclusive resistance current with luxurious jetted massage seats all wrapped into one package. Endless Pools E-Series Resistance current gives you an swim experience that is absolutely unmatched by any other swim spa on the market. If you are a serious swimmer, the E-Series by Endless Pools is the obvious choice. dd the optional underwater treadmill and you have the ultimate fitness machine.