“ok, here's the thing, if you have a BIG cat, like my 18 pound chonker, you'll need extra clay litter. this dude pees so much, you won't believe. he's fine, he's healthy, not diabetic, just loves water and pees a lot.........so just be ready to scoop up BIG chunks of clumped urine...... i just top it off with some cheap litter from the grocery store and i get by fine- i love the disposable litter box otherwise. throwing it out and getting a new one every month is a god send for my messy dude”