Find the capacity of your water tank. For a 15 gallon tank, add 1/4 cup of liquid chlorine bleach to 1 gallon of water. If your tank is 20 gallons, you would need 1/3 cup of liquid chlorine bleach to 1 gallon of water.
Close all faucets and drain valves.
Add the chlorine water solution into the fresh water filler tank spout.
Using a hose that only is used for fresh water, fill the rest of the tank.
Turn the water pump switch to "On."
Go to each faucet in your trailer and turn it on and let it run until you smell a slight odor of chlorine, then turn it off. Do this for each faucet, including the cold and hot water spigots for each faucet. Also do this on drain plugs on the outside of your rig.
Fill the water tank back up to capacity and let the water sit in the tank for three to four hours.
Open all the fresh water faucets, drain valves and water tank valves and drain your entire fresh water system.
Close all the water faucets, drains and valves and repeat Steps 4 to 7 with fresh water. Do not use any chlorine solution for this step. This will flush out the chlorine.
Drain out all the water again from all faucets, spigots, drains and plugs..
Close the faucets, drains and plugs and refill the water tank from the fresh water hose.
If the water still has a chlorine taste, prepare a solution of 1 quart vinegar to 5 gallons water and put it in your water tank. Drive your rig around a while to agitate the water and drain and refill your tank.
