Hello,

Turn off any water heater and entirely drain the fresh water system. After the system is drained, make sure all the water valves and faucets are closed.

Mix the bleach
You will be using ¼ cup bleach for every 15 gallons of water capacity in your system. Divide the capacity of your system by 15. Multiply this number by .25 to find how many cups of bleach are needed. Do not directly add the bleach into the water tank. Using a funnel, add the required amount bleach to the gallon jug and top it off with water.

Pour the bleach
Carefully pour the diluted bleach solution into the empty water tank. Use the funnel to avoid drips.

Fill the system
Fill the fresh water holding tank completely with cold water. After it is filled, open each water faucet one at a time and allow the water to flow until you smell the bleach in the flowing water, then shut the valve. Don't forget the shower, hot water valves, or any hand pumped faucets.

Sanitize
At this point the bleach solution should be in every part of the fresh water plumbing. Allow 12 hours for the bleach to sanitize the system.

Flush
Completely drain the bleach solution from the water system. Fill the water tank with fresh cold water. Open all valves and faucets and run the fresh water through the plumbing until the strong bleach odor is gone. Top off the water tank and your system is ready.