In order to study the effect of the fiber size we tested different fiber sizes as prepared according to the above description. In all these experiments we saturated the column filter and then we estimated the maximum mass of the retained TDS. Fig. 6 shows the evolution of the retention efficiency for modified and unmodi- fied bagasse fibers. The results show that the maximum of retention can reach 60 mg/g of unmodified material and 78 mg/g