Heavy metals separator - KONVALIN; LAURENCE H.
An impeller 13, inside the tank, consists of a flat blade 14, affixed on a vertical shaft 15, which is either manually or mechanically rotated. The tank is made of a cylindrical side wall 16, and a horizontal bottom wall 17, from a center of which a sand and gravel collector pipe 18 extends downwardly, having a central passage 19 therethrough.