Walex Bio-Pak Holding Tank Deodorizer - Tropical Breeze Pack of 2. This deodorizer is ideal for RVs and boats. Bio-Pak Holding Tank Deodorizers have unbeatable odor prevention and are prepackaged for portion control and to prevent spills. These dissolving packets rapidly break down waste and paper clean the sensors and lubricate the valves. There is a slide zipper bag for easy storage. This product is biodegradable and Formaldehyde-free. Available in Fresh Scent or Tropical Breeze. Features of Walex Bio-Pak Holding Tank Deodorizer - Tropical Breeze Ideal for RVs and boats Removes odors and breaks down waste and paper; Cleans sensors and lubricates valves Biodegradable and Formaldehyde-free Prepackaged portion control- No Spills Quantity: 10 Pack Package Contents: Walex Bio-Pak Holding Tank Deodorizer - Tropical Breeze Walex BIOTROP2: Bio-Pak Holding Tank Deodorizer - Tropical Breeze Pack of