The following instructions were plagurized from
RV Basics
Sanitizing Your RV Fresh Water System
Insuring clean, safe drinking water in your RV requires sanitizing your fresh water system. For a new or new-to-you RV you will want to sanitize before your first use of the system. You may also want to sanitize the system if your RV has not been used for some time, for example if it has been stored for the winter.
The usual procedure as outlined below involves filling the fresh water tank with a solution of household bleach and running the solution through each faucet. Then letting it stand for at least three hours. Finally, flush the system once or twice to remove the taste and smell.Here's the procedure.
* Turn the water heater off and let the water cool.
* Dilute 1/4 cup of household bleach for each 15 gallons of tank capacity in a gallon of water.
* Add the chlorine solution to the water tank. Never pour straight bleach into the RV water tank.
* One faucet at a time, let the chlorinated water run through them for one or two minutes. You should be able to smell the chlorine. (Make sure you are using the water pump and not an external water supply.)
* Top off the water tank and let stand for at least three hours over night is better.
* Completely drain the system by flushing the faucets for several minutes each. Open all plumbing drains (if any) and the hot water tank drain plug and drain until the tank is empty.
* Close all valves and faucets and drain plugs.
* Fill water tank with fresh water.
* Flush each faucet for several minutes each repeating until the tank is again empty. (Make sure you are using the water pump and not an external water supply.)
* Fill the tank again. The water should now be safe to drink but if the chlorine odor is too strong you can repeat the fresh water flush. To lessen the chlorine smell you can disolve 1/2 cup (per 15 gallon water capacity) in a few gallons of water, and run it through the system as per the bleach instructions.
Your fresh water system should now be safe for use.
An alternative method would be to use Chlorinating Concentrate (Sodium Dichloro-s-Triazinetricone or Sodium Dichlor for short). Sodium Dichlor contains 62% available chlorine. Compare that to household bleach which has something close to 3%. One pound of Sodium Dichlor is equal to 8 gallons of bleach. Also, household bleach contains other stuff, including a lot of salt, and that other stuff is what causes the bad taste and why you have to flush the tank.
It takes only 1 teaspoon of the concentrate per 100 gallons of water to initially sanitize the system. Remember to run water through all the faucets. After that, just a half teaspoon per 100 gallons with each refill will keep the tank fresh.
This is not a case where more is better. This stuff is concentrated and it's best to use what is recommended.
Because Chlorinating Concentrate is so highly concentrated you only need to carry a small container. And it is dry crystals so there is less chance of a spill. However, because it is so concentrated it is highly corrosive so you do have to be careful how you store it and use it.You should be able to find Chlorinating Concentrate at any pool supplies or spa store.
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