uwe JetStream invented the countercurrent system in 1967 and named it after a unique weather phenomenon: the jet stream, a current of high-speed winds blowing several miles above the surface of the earth. The creation of JetStream revolutionized the traditional swimming pool. Today JetStream offers you different types of countercurrent systems that all have one thing in common: a current, activated and regulated at the push of a button, that transforms the smallest pool into a huge challenge. Even for the most seasoned swimmers.