Welcome to our forum.
Bosco,I think you're talking about a micro filter. Microban is a chemical they treat traditional filters(and spa shells) with to kill bacteria. Anne,Like Brewman said, if you maintain proper sanitizer levels there is no need for Microban. Save your money.
Anne,I noticed that the Arctic manual says to only use Stain and Scale inhibitor in cases of extremly hard water (for example: well water). It almost seems like the Micropure filter eliminates the need for Stain and Scale inhibitor.