It's understandable to want to keep your black water tank clean and sanitized, but using bleach is not the best choice. Bleach is a harsh cleaner that can damage the rubber seals in your tank, leading to drying and cracking over time. If your tank's seals become damaged, it can cause serious problems for your sewage system. Instead of using bleach, consider using gentler cleaning options like vinegar or baking soda, which won't harm your tank's components. Remember to always read the manufacturer's instructions before cleaning your black water tank, and if you're unsure which products are safe to use, consult with a professional. Keeping your tank clean and well-maintained will help ensure a trouble-free camping or RV experience.