Here are the steps to sanitize your RV fresh water tank and associated fresh water lines. Your RV’s fresh water tank and lines need to be sanitized at least once every six months. It should be part of every RV’s maintenance schedule. Sanitizing your RV’s fresh water tank and associated fresh water lines is easy – but it does take a little time. The most important thing is to wait the appropriate amount of time for the tank to be properly sanitized.
Some things to consider before you start.
- You need at least 5 to 10 hours to complete this task.
- Do you have internal and or external water filters? If so, you should change the filters after you have finished sanitizing the RV system.
- Do you have a hot water tank? If you do, now might be a good time to flush out your hot water tank.
- Read through all the instructions BEFORE you start!
— Turn off Water Heater and allow the water to cool down! —
Put Chlorine in RV Water Tank. Chlorine must be diluted before being put in your RV water tank. The suggested mix of chlorine should be about 1/4 cup of chlorine for each 15 gallons of your RV water tank capacity. For a 75 gallon fresh water tank, aproximately 1 1/4 cups of chlorine (e.g., Clorox works just fine) is needed to adequately sanitize the tank.
Fill Water Tank With Fresh Water. Now, fill your fresh water tank with fresh water until it is full. The electrical gauges give you an idea of the water level in the tank, but I prefer to fill the tank until it starts to overflow. (Then, you know for sure that it is completely full.)
Shut Off Fresh Water Supply and Turn on Water Pump. The next step is to be sure that you turn off the fresh water spigot or hose, so that no water enters the RV from an outside source. Then be sure to turn on your RV water pump (since you will be using it for almost all of the sanitizing procedure).
At this point, you should have a full fresh water tank that has a properly diluted amount of chlorine in it, the fresh water supply from outside the coach is shut off, and the RV water pump is turned on. So far, so good.
Flush Out RV Water Pipes. One at a time, open either the hot water faucet or the cold water faucet on the kitchen sink and the bathroom lavatory. Let each faucet run until you can smell the chlorine. It won’t hurt to let the faucet run longer. Continue with each faucet (both hot and cold), until all the faucets have been opened.
It is not really necessary to worry about the toilet or the shower, but some of the ladies may feel more comfortable if the shower is also fully sanitized.
Let the Chlorine Sit in the Pipes. Once all the RV piping has been filled with the chlorine solution, let the chlorine sit in the pipes for at least six hours (12 hours is better). Some folks find it easiest to start the process in the evening and let the pipes “soak” over night. For those of you always in a hurry, a three-hour soak period can be adequate, but the longer period gives most folks a better sense of comfort.
Since you will end up having to drain the fresh water tank, I usually just turn on all the faucets, one at a time, letting the water pump empty the fresh water tank of the remaining chlorine solution.
Drain the Water Heater. Now for the more difficult part of the process. Your RV water heater needs to be drained of the chlorine solution. On some RV water heaters there is a separate drain valve; on other RV water heaters you need to unscrew a large nut-like bolt that is also the anode rod for inhibiting corrosion. Open the drain valve or remove the anode rod and let the water heater drain completely.
If you have the type of water heater that has an anode rod, now is also the time to be sure that all of the loose particles of gunk are flushed out of your water heater. (You can buy a small copper wand used for just this purpose from your favorite camping supply store.)
When the water heat has been fully drained, don’t forget to close the drain valve or re-insert the anode rod and tighten it.
Once the fresh water tank is empty, and the water heater has been drained, refill the water tank with fresh water and let the water heater also be refilled from an outside fresh water source, (a city water source is better). Then, remember to once again turn off the outside water source. When refilling the water heater, I briefly open the pressure-relief valve near the top of the water heater to let any air escape as the tank is refilled.
Flush Out All RV Pipes and Water Heater. Once the fresh water tank is again filled with fresh water, it is time to repeat just about the whole process—to flush your water system with fresh water. Be sure to turn off the outside source of fresh water, and be sure that your RV water pump is still turned on.
Turn on each faucet, one at a time, and let the fresh water rinse out the pipes—until there is no chlorine smell coming out with the water. After all the faucets have been “rinsed” and you can no longer smell any chlorine, I usually continue the procedure until the fresh water tank is again empty. (I usually find that it is more difficult to get the chlorine out of the hot water pipes and water heater, so don’t be surprised if it takes longer to get rid of the chlorine smell.)
Once you are satisfied that the chlorine smell is gone, go ahead and turn the outside fresh water source back on. I usually like to always have about 1/4 of a tank of fresh water, so that we can wash our hands or flush the toilet while we are rolling down the road. After the above procedure, we usually fill the fresh water tank to about 1/4 full.
Remember to turn your water heater back on!