Ever hear of this stuff? It is litter with blood detection granules in it. Just curious if it works or not. It is supposed to help detect urinary tract infections. It was on clearance at petsmart for $3.00 so I bought 2 to try it out. I suspected 2 of my cats as possibley having a problem in that area so for 3 bucks why not...Anyone use this? Was I ripped off of 6 bucks?