Check out this Instagram Post (https://www.instagram.com/p/BocnEBmnJZH/?utm_source=ig_share_sheet&igshid=w9ws0v0p11dq)
In particular, swipe over to the 4th video and hit play... never seen a stone "refreshed" like that!
(https://forum.tormek.com/index.php?action=dlattach;topic=3778.0;attach=2811)
(Don't bother hitting play on the above picture, it's just a screenshot). ;)
I just purchased the Kindle version of the book they wrote, Sharp: The Definitive Introduction to Knives, Sharpening, and Cutting Techniques, with Recipes from Great Chefs. Looks really promising!