At this stage a clay plug at the level of the scum would be smashed out and the scum run off, similarly a plug at the bottom would then be removed and the iron run off into a prepared sand bed.
Similarly a plug at the bottom would then be removed and the iron run off into a prepared sand bed. At this stage a clay plug at the level of the scum would be smashed out and the scum run off.
At this stage a clay plug at the level of the scum would be smashed out and the scum run off. Similarly a plug at the bottom would then be removed and the iron run off into a prepared sand bed.
At this stage a clay plug at the level of the scum would be smashed out and the scum run off. Similarly a plug at the bottom would then be removed and the iron run off into a prepared sand bed.