a static mixer tank includes upper / first and lower / second mixing chambers , with the two mixing chambers being separated by a swirl chamber . the upper mixing chamber is arranged at an upper end of the mixing tube where materials would initial begin passage there through , and the lower mixing chamber is arranged at a lower end of the mixing tube and receives materials that may have to some degree been mixed by their passage through the upper mixing chamber . a series of baffles in the mixing chamber are arranged in sinusoidal or saw - tooth pairs that can be oppositely arranged , so that the mixer turns a drop of water into hundreds of micro - bubbles of rotating fluid , which allows the chemicals to exit the mixer and react with fluid in a storage tank as much five times faster than previously known . a variation includes a sand trap using the swirl chamber , cap , diverter chamber , and diffusing plate to separate sediment from a liquid without using a filter of moving parts .