The next two postings are in response to the recent postings about cat litter boxes and cat litter. It does take a pad to collect urine, but we use newspaper. If I was completely Zero Waste I would get the underground compost container for the newspaper and fecal material. But haven't gone that far yet. These reusable rock litter boxes can be purchased from a national pet catalogue company, Fisher or something like that.
Urine tends to sink to bottom and permeate material.
Not easy to see wetness or judge quantity expelled if you have to monitor your cat due to urinary tract problems. Harmony - Recycled content, flushable. Tends to be odor-free longer than Good Mews, but breaks down more quickly in pan. Also not easy to monitor amount of urine. Easy for monitoring but not for disposal.