Foamsol Foamsol S silicone antifoam is an inert polymer which is highly effective in foam suppression in both the kettle and fermenter. It preserves foam-positive proteins which contribute to the head retention quality of beer. One of the most important benefits FCS 130 is increased iso-α-acid utilization from hops. Controlling foam in the fermenter will retain iso-α-acid and allow a reduction of up to 15% of the kettle hops. Other benefits include increased kettle and fermenter utilization, as well as eliminating the loss of product from foam during fermentation.