Aqua-Kem Toss-Ins Holding Tank Odor Protector by Thetford. 6 Pieces. These professional-strength products are what RVers use to show love to their vehicles. They make old RVs look new. and new RVs look even better. Each product is specially formulated for a specific job. and is quick and easy to use. FeaturesPowerful odor controlLiquefies waste and breaks down tissue fast to prevent cloggingPowerful detergents clean tank walls and drain linesWorks around the clock in all weather conditionsSpecificationsCountry of Origin: United States.