over chlorinated water holding tank

I use a baking soda solution. I mix a small box of baking soda in a 1 gallon water jug and let it dissolve completely and then pour into the tank with about another 5 gallons of water. Drive around a little bit and run the water from the fresh tank through all faucets, toilets, and drains.

Then fill tank with fresh water and do the same with the driving and faucets.

Ron