“…Solving Equation by separation of variables leads to where c 0 and c L are the concentration values at the filter inlet ( z = 0) and outlet ( z = L ), respectively, and is the mean filter coefficient. As usually λ changes with deposition, it is often expressed in the literature as a function of σ : where F is a functional expression that modifies the initial filter coefficient, that is, of the unclogged filter, depending on the deposition and a number of model parameters contained in the parameter vector P . Thus, only for short filtration times, the assumption λ = λ 0 can be made, which also implies F = 1.…”