Intersand Odourlock MaxCare granules use Blücare technology to detect blood and glucose in urine, markers for urinary disease and diabetes. A simple way to keep an eye on your cat's health right in the litter box. • Granules turn blue when they detect the biomarkers • Made mostly of starch and cellulose, completely safe • Simply spread over fresh litter in a clean box If you see a colour change, check in with your vet.