Keypad test the properties of the sinking particles (Settling characteristic) that settling with the gravity of the Earth. Both fill and no additives, sludge
Inter Test settling down of the particles (Settling characteristic) was precipitated by the force of gravity. Both with and without the addition of flocculation.
To test properties from the sinking of the particles. (Settling characteristic) which precipitated by earth's gravity. Both with and without the extraction flocculation.