Polystyrene is an inert, large molecular weight compound that does not breakdown in aqueous solutions. Polystyrene does not act as an absorbent like activated carbon, nor is polystyrene very permeable to liquids. The chemical resistance of polystyrene is well known. It is not attacked or degraded by long exposure to either bleach, soap solutions, or common household products that are poured down the drain. Polystyrene is virtually resistant to all aqueous media including dilute acids and bases.