After
washing and removing as much of the coarser material as
possible, add sufficient water to the pan to bring the level to
about 13 mm (1⁄2 in.) above the surface of the 425-μm sieve.
Agitate the slurry by stirring with the fingers while raising and
lowering the sieve in the pan and swirling the suspension so
that fine material is washed from the coarser particles. Disaggregate
fine soil lumps that have not slaked by gently rubbing
them over the sieve with the fingertips