Review on Premium PetSafe ScoopFree Cat Litter Crystal Tray Refills - 3-Pack for Self-Cleaning Boxes - Non-Clumping, Odor Control - Choose Original Blue, Lavender, or Sensitive! by Amanda Quinn

I LOVE this product! These fillers are expensive, around $15 each. As an aside we have two cats and just moved from a big house to a townhouse and I love this product. At our house, since we installed a cat door, we can store a tray in our garage, but that's not possible in a townhouse. We have been using these cup fillers for 5 weeks now. We set up a ScoopFree litter box with a mat, sold separately, to collect blue litter crystals from the litter box. The litter boxes themselves are easy to install - just lift the body of the litter box (it's clean), take the lid that came with the new litter box and cover the old litter box with it (perfectly odourless!), then place a new one in place Litter box on it, in the same place as the old tub, and lower the body into place. (I use strong tape to secure the lid to the old litter box so it doesn't fall apart when I throw it in the trash.) One of these containers lasted us about 8 days (with 2 cats). You can use the crate 35 times (counting the tray) before we even notice any smell. I hate trash cans and this is a great product! Incidentally, I bought my ScoopFree litter box for $200 at my local major pet store and then found it online at Revain for less than $100.