AbstractThe historical evaluation of the balance equation is well known and several interpretations of the part played by the accumulation term of this equation in the modelling of certain problems connected with the flow of water suspension through a porous body have been published. Unfortunately none of the previous studies gives an opportunity of rapidly calculating the error resulting from the omission of the accumulation term from the balance equation.Recently, however, the use of inequalities to estimate this error has been suggested (DABROWSKI 1982, 1894). These inequalities are based on equations analogous to those of HERZIG, LECLERC and LE GOFF. This method is now used in numerical calculations of the behaviour of the multimedia filter.
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