Klarstreu, the cat litter that watches for trouble

Field notes

Klarstreu uses indicator granules in 6.2 liters of silica litter and maps their color to four zones, from normal through possible blood. Customers are instructed to photograph changes, compare them with the supplied card, and build a multi-week history in the app. The page lists €14.90 for the first delivery, followed by €24.90 monthly, with 2–3-day shipping and monthly cancellation or pausing. Its medical interpretation and reported subscription figures remain claims made on the page.