Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate) ? August 22, 2021February 18, 2019 by admin Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate) ? A. S B. 1/R C. 1/μD. All A., B. & C.