media replacement

I have two homes in Southern Ontario my principal residence in the north of Bolton area and an investment property in Kitchener acquired about 18 months ago. Both areas are known for hard water. Both homes have a clack WS1 valve/system and in my principal residence I had the softener replaced...

I want to replace the sand and carbon media in the tank and reseal this older unit for my Dad. I've read all the threads here on this model and watched all the YouTube videos I could find, and have downloaded the Super S installation/operators manual from several sources... But none of them...