How do I sanitize my water softener?

After extended periods of non-use, sanitize the unit by following the instructions below:

Step 1: Perform back flush.
Step 2: Completely drain all the water from the tank (do not dump the resin out)
Step 3: Remove top cap and mix 1/4 packet of Sani-System with a gallon of water for the Standard Model, 1/2 packet of Sani-System with 2 gallons of water for the Double Standard Softener, or 1 full packet of Sani-System with 4 gallons of water for the Park Model Water Softener.
Step 4: Pour solution into tank, put the top cap back on, and let it sit for a maximum of 60 seconds.
Step 5: Turn the water on full stream for 10 minutes and flush the Sani-System out.
Step 6: Perform regeneration.