referred to as a sand removing tank 24 or setting pit from this setting pit 24 the compound is pumped by means of the second vane pump 25 through a sand removing unit 26 which may comprise one or more hydrocyclones 27 preferably a plurality of hydrocyclones in parallel and also a classifying unit for instance implemented as an optional vibrating screen 28 from the bottom of the hydrocyclones 27 wet particles 29 having a relatively large but not classified size fall out while water including very small particles of the crushed drill cuttings dispersed or emulsified therein shall flow out from the top of the hydrocyclones this dispersion comprising the small drill cuttings and water is led up into a third container which may be referred to as an output tank 30 and from this the dispersion is pumped further by means of the third vane pump 31 to the last tank 32 which may be referred to as an injection tank the pump 31 used at this stage may also preferably be a so called agricultural pump if the output tank 30 is overfilled the overflow shall be guided backwards arrow 33 to the setting pit 24 as long as the injection tank 32 comprises a redundant amount of liquid this redundant amount will flow backwards via the feedback tube 34 to the output tank 30 the dispersion therefore shall circulate in the plant all the time and it will be thickend steadily more as more solid matters 20 are added considering the particles falling out from below the hydrocyclones 27 these particles will fall down into a gathering pan after having passed through the meshes in an.