Good product
This product is good and fulfills it purpose. However, as the owner of two male kittens, I have had a bit of a problem with the filter, as they have been pulling it out of the top. As they are indoor cats and unaccustomed to flaps, I used the litter box swing flap to cover the filter, after which they have lost interest in the filter. Other than that, I am very pleased with the product and would recommend it to others.
PS. If the filter had been completely covered, I would have given 5 stars.