The E550 offers a unique swim experience with plenty of room to move around. With Standing spa zones, you maximize your active area without losing therapy zones. The E550 measures 15′ long x 94″ wide with 2 standing jetted zones. For those seeking better overall wellness, including your physical, mental, and emotional states, the E550 may just be the machine that brings it all together. The E550 Combines Endless Pools’ exclusive resistance current with luxurious jetted standing zones all wrapped into one package. Endless Pools E-Series Resistance current gives you a 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.