In the above publication describing the research of a fundamental nature presents one of the methods for determining the constant coefficients a gravity filtration. occurring in the general equation filtration (Piecuch 2009, 2010). The laboratory tests concerning the gravitational filtration were performed, applying variables: capacity of the feed (1 dm³, 1.5 dm³, 2 dm³), a degree of density (10 g/dm³, 20 g/dm³, 30 g/dm³, 40 g/dm³) and medium pressure of the column of liquid. As polluting the feed they used the hard bituminous coal about the determined faction entered into within the limits of by 0.315 mm up to 0.5 mm which was larger than the diameter of eyes on the mesh filter. With such experience modeled density of the filtrate was zero. This is important for the transfer of a basic research on studies of an application. Based on received results prepared graphical and tabular statement. The first series of tests and calculations is set to a constant mesh filter t', which has risen with the increase in pressure filtration. In the second series of tests and calculations is set to a constant coefficient b in the equation of resistance occurring sediment and the general equation of filtration (Piecuch 2009, 2010). [...]