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Welcome to the forum! It's non-permeable, won't absorb bacteria or odors, and will last as long as you own the spa.
Are you saying that the sand or blue WILL absorb bacteria and odors? If so, that must be a Watkins exclusive
No sir, sand and Azurite will NOT absorb bacteria, odors, or spa cooties. And, all this protection is inherent without having to add Microban.Terminator
Might that be because they are acrylics, hmmmmm? Now as for rovel, or endurol or what ever name it's being called by, that a different story. Maybe they should add microban to that stuff!