Time-released tablet continuously cleans evacuation system lines. Restores pressure, and extends pump life. Keeps vacuum lines functioning at peak efficiency. Compatible with amalgam separator systems. Neutral (7 pH) formulation follows EPA Guidelines for waterline management. Does not contain bleach, chlorine, iodine, peroxide, or any oxidizers. Use 1 tablet weekly.- Vacuum Clean, 45 tablets/jr (US SALES ONLY)