Keep your cats litter tray fresh with the SimpleSolution Litter Odour Eliminator. The pro-bacteria and enzyme formula digests odour-causing residue to totally eliminate execrable litter box odours. This bottle is 100% dust free and can deliver more than 60 treatments. Just spray 10 to 15 times over the litter lightly, then respray. Reapply as needed and change litter when necessary.