1. Spread entire contents across the top of the litter once a month after refilling your cat’s litter box.

2. Wait a short while after your cat uses the litter box, then compare the colour of the crystals at the urination spot to the colours on the enclosed chart. A healthy cat’s urine will show light to dark yellow crystals, while any other coloured crystals would suggest an immediate trip to the vet. Abnormally discoloured litter should be removed with a plastic cup or spoon.

3. After completing the test, stir into the regular litter to help eliminate odours.