General Sanitation and Maintenance Practices
In addition to using Dometic's specific treatments, following best practices for holding tank maintenance is crucial for an odor-free and functional system.
- Use Plenty of Water: Always prime a new or empty black tank by adding at least a gallon of water before use to help prevent solids from sticking. Use ample water with each flush (the "two-flush method" is recommended for some toilet paper) to facilitate waste breakdown and transfer.
- Drain When 1/2 to 3/4 Full: The best time to drain the black tank is when it is between 50% and 75% full, as the volume helps create a "whoosh" effect for a more complete flush.
- Flush and Rinse Thoroughly: After draining, use the tank's built-in rinse system (if available) or a toilet wand to flush the tank with clean water until the water runs clear. Rinsing the gray water tank after the black tank can also help clean the sewer hose.
- Regular Treatment: Add the recommended amount of Dometic holding tank treatment after each emptying to maintain a healthy bacterial environment, break down waste, and control odors.
- Sanitize Fresh Water Tank Annually: The freshwater system (potable water) should be sanitized annually using a diluted household bleach solution (1/4 cup of unscented bleach per 15 gallons of tank capacity), run through all the lines, left to sit, and then flushed with fresh water until the bleach smell is gone. This process is separate from black/gray tank maintenance.
- Inspect Seals: Regularly check toilet seals and gaskets for dryness or leaks and lubricate them with a food-grade silicone spray to maintain their effectiveness and prevent odors.