Do you put in black tank treatment pod prior to storage?

During the season for black and gray water, after dumping I add 1/2 cup of that orange Camco toilet treatment to a couple of gallons of water. I do this for storage between trips too. For winter storage I rinse the black and grey tanks well let them drain, close the valves then add a couple of gallons of Antifreeze.
After 4 years, so far so good.