Hook up a hose to your city water connection. Open up one faucet one at a time until the water runs clear. Do both hot and cold, inside, outside shower. Turn off the water to the TT. Put your hot water plug back in the tank if it's out. Un-bypass your hot water heater by twisting valves 180. Turn on at least one hot water faucet. Turn on water and your hot water heater will fill. Dump grey an black tanks before camping (optional).