Product Short Description: RXSOL Defoam X additive is a low-toxicity blend of defoaming agents formulated to control foaming in muds containing freshwater or seawater and in viscous brine systems. Product Description: RXSOL Defoam X additive is a low-toxicity blend of defoaming agents formulated to control foaming in muds containing freshwater or seawater and in viscous brine systems.