For BSA and BSA/CaCl2 solutions, UH030 and Inside Céram
50 kDa were the membranes that presented the highest flux
decrease. The main reason could be related with the molecular
weight cut off of these membranes, since the pore size of both
membranes are much closer to the BSA size (66 kDa). This was also
observed by Qu et al. [29]. These authors fouled three PES membranes
(with molecular weight cut-offs of 10, 30 and 100 kDa) with
extracellular polymeric substances.