I recently read a small blurb saying that Aluminum Oxide crystals
     will (after time and usage) have the corners rounded and will result
     with a "peening" instead of a "toothed" scrub on copper layers. We 
     installed an Aluminum Oxide scrubber 6 mos ago and (to the best of my
     knowledge) never encountered this. The system decants the small broken
     up particles and we replenish based on usage. Initial tests proved
     a more pronounced topology with better dryfilm adhesion.
     I was just wondering if other people recently have ran into the
     "peening" problem or was that just a skeleton from times past?
     
     Groovy