This cistern or tank with its automatic method of drawing off the clear top water, leaving the sediment at the bottom of the tank, is indeed a practical arrangement. The illustration explains itself. The sediment separator, that is, the floating tub, is of brass with copper float, with or without cock. The clear top water may run off through it at the rate the sediment precipitates, the float being always level with the surface. By a stop-cock on the outside of cistern the flow may be regulated.

Fig. 35.   Settling Tank with Sediment Separator

Fig. 35. - Settling-Tank with Sediment Separator.