To keep your RV's sewer system in good working order, it's important to replace your sewer hose periodically. The frequency of replacement depends on how often you use your RV. If you're a full-time RVer, meaning you live in your RV year-round, you should replace your sewer hose every two years. This is because full-timers use their sewer systems more frequently, which can cause wear and tear on the hoses. If you camp less often than that, you can wait up to three years before replacing your sewer hose. However, it's important to inspect your hose regularly for signs of wear or damage, such as cracks or leaks. If you notice any issues, it's best to replace your hose sooner rather than later to avoid any messy and unpleasant surprises.