You put the hose in the jug, open the valve that is between the hose and the pump. Close the valve on the line coming from the fresh tank to the pump (image below). Insert hose in jug. Make sure hot water heater is bypassed by turning the appropriate valves (image below). Turn on pump. Open each faucet one at a time, hot and cold, until the pink stuff comes out then close each faucet one at a time. Don`t forget toilet and outside shower. Also open low point drains momentarily until pink comes out. If it takes more then one gallon turn off the pump and insert the hose in the second gallon. Pour a cupful or two down each sink and in black tank.