Watersol™ Soluble Film Watersol™ Film (WSF), also known as PVA film, is a packaging material that is safe for the environment and fully biodegradable when disposed of in water or in waste. Watersol™ … Watersol™ Film (WSF), also known as PVA film, is a packaging material that is safe for the environment and fully biodegradable when disposed of in water or in waste. Watersol™ …