i have bought this product for the past 13 years and would hae recommended it. then over the past year something changed. it doesnt cover the odar as well as the past. when the cats uses it and pees, it forms a super large rock hard chunk almost like cement. i had to use a garden trowel to break it free from box. comes out in large masses- uses way too much litter. would change litter maybe every three weeks, now i add more ever 3-4 days. the litter catches on the cat and sticks to the fur - hard to get off. what happened... dont change whats a good thing!!