The mixture is then pumped into filter presses where the water is squeezed out, leaving a stiff solid, which is compressed and extruded to compact it still further.
(The mixture; is pumped; into filter presses; T:then) (a stiff solid; to compact still further; it) (the water; is squeezed; out; L:filter presses) (a stiff solid; is compressed; ) (a stiff solid; extruded; to compact it still further)
The mixture a stiff solid the water a stiff solid a stiff solid
is pumped to compact still further is squeezed is compressed extruded
into filter presses T:then
it
out L:filter presses
to compact it still further