Catsan Smart Pack Is The First inlay pack for the cat litter tray. It consists of an absorb-Active micro-fleece beneath a layer of catscan hygiene litter. The micro-fleece actively absorbs the liqiud and prevents it escaping. This reduces the chance of odours forming and the litter stays noticeably fresher and drier for longer compared to ordinary cat litter products. Instructions for use Place catscan smart pack into the litter tray tear open the perforation mark where marked and roll over the long side of the tray. And it's ready. Catscan smart pack can be completely disposed of after approx 1 week or can be refilled with some fresh catscan hygiene litter.