I apparently started buying this stiff after the product changed from a fine powder to granules. Im not sure what it was like before this change, but Im thrilled with the Phos-bind Ive been getting. Its a fine granule size, smaller than both salt or sugar. Ive never tried to dissolve it in water, so I cant speak to that. Its flavorless, and my dog isnt real picky so I dont need to do much else other than dumping the scoops in between the cups of food. I dont even bother mixing it in, it gets eaten. Since my dog was diagnosed in July, her phosphorus level has gone from 10.9 mg/dL to a level of 3.6 mg/dL, which is comfortably within normal limits. This stuff is now on auto-ship and my dog is doing great!