The ScoopFree Premium Blue Crystals Litter Tray is easy to use. You empty the blue crystals into the cardboard tray and shake the tray to get the crystals even. The crystals absorbs the cat urine fast and it dries out the waste. Each tray last me about 3 weeks before I change it out.. when you are done with a tray you just put a lid on the tray and throw it away without having to scoop up anything.