Intersand Odourlock is a clay litter featuring Smart Odour Shield technology this is the only cat litter that neutralises urine and other odours for up to 40 days. Super effective and safe for you and your cat, Odourlock offers more benefits than any other litter on the market: 40 Day odour control. Terrific absorption rate. Low dust. Gentle and comfortable for your cat. Fast clumping and easy to scoop and clean.