After using this product I can honestly say it has been a game changer. No longer do I have to put up with horrendously smelling number twos, and I've saved tons of time on litter box maintenance. I have 1 cat and can get around 10 days per refill, I can tell it is time for a change. The cats tend not to track as many crystals out of the box as with regular cat litter.  Overall I would highly recommend these crystals.