rvflushguide 
TL;DR: RV toilet bubbles when flushed usually means air or gas is trapped in the black tank system with nowhere to go. The most common causes are a full or nearly full black tank, a blocked roof vent pipe, a pyramid plug under the toilet, or a clog in the drop pipe. Start by checking … Read more
TL;DR: Dometic RV toilet ghost flushing means water is trickling into the bowl without you flushing. The most common cause is a worn water inlet valve (part #385311641). For most owners, replacing the valve fixes it in under 20 minutes. This guide covers all 4 causes, how to tell if it’s actually a problem, a … Read more
TL;DR: Water at the base of a Thetford RV toilet does not always mean the floor seal is the problem. The leak can start at the blade seal, water valve, vacuum breaker, or even a loose mounting bolt. Water runs down to the lowest point, so the base is where it shows up, not always … Read more
TL;DR: You don’t need expensive RV-specific toilet paper for every trip. If your regular toilet paper is labeled septic-safe and passes a quick jar test, it’s safe for your black tank. The bigger risk isn’t your paper choice. It’s using too little water per flush. That said, rapid-dissolving RV-specific paper is the safer pick for … Read more
TL;DR Finding the best RV toilet replacement starts with one number: your rough-in measurement. If you have 11 inches or more, the Dometic 320 gives you the most residential feel available. For tighter bathrooms, the Dometic 410 is the standout current-generation porcelain pick with a 7.625-inch rough-in. Budget buyers should look at the Dometic 400 … Read more