CATSAN Smart Pack is the only inlay pack for your cats litter tray consisting of a super absorbent liner sitting beneath a layer of CATSAN Hygiene plus cat litter.The liner actively absorbs the liquid underneath the Hygiene Litter and locks it in safely. By doings so, the litter stays noticeably dryer for longer, whilst providing your cat with a further improved odour control. The two CATSAN Smart Pack Inlays are as efficient as 30 litres of conventional non clumping cat litter