You can spread the granules wherever your cat urinates, even on the carpet. However, you'll need to ensure there are no cleaning solutions present that may affect the test results.

Because the granules can detect even the smallest amount of blood in your cat’s urine, any color change to BLUE means you should consult your veterinarian as soon as possible.

The cats we tested did not react to the presence of the granules, and there did not seem to be any noticeable smell.

First, add the granules to your cats' shared litter box. If granules turn BLUE, you'll need to separate your cats so each has their own litter box. You now have two options. You can add granules to each litter box (this will help determine which cat was responsible for the color change). Or, if you suspect which cat needs specific monitoring, add the granules to its litter box only.

Use one whole packet when spreading into your cat's litter box. Since each package includes two packets, be sure to seal the other packet in the original package to protect it from sunlight. The long shelf life of the product, two years in the sealed packaging, is also beneficial, and the granules remain effective for 30 days when placed on your cat’s litter.

The frequency of monitoring is based on the health of your cat. Talk to your veterinarian about any urinary concerns or behavior changes, and ask whether this home monitoring tool could be helpful when you are concerned.

It can be used with most litters available on the market. For best detection results, a clay-based (bentonite) clumping litter should be used.