“I have tried both the regular and fine grain silica litter. Fine grain is by far my favorite. It is very absorbent and there is no urine odor for the entire month. I also like this litter best for scooping the poo better because I don’t feel like I lose as much litter when scooping. It does track a little more but the tracking is so much better than regular clay litter. I have two cats and three boxes. I buy two refills a month and rotate one box in and out of the refill cycle and have had no problems. I also have a problem pooper who likes to poop out of the box when his routine is upset. Since I became a member of the kitty poo club, he has not had any poops out of the litter box. I’m really pleased with this product.”