For this, the litter box should be freed from the old litter and thoroughly cleaned. Then give sufficient Following the KatKor-plastic ball scattered in the toilet. Adequate means that the soil should be well covered. We have this "scattering" first get from the vet, then a bag has enough proved significantly (for cat litter in normal size). Best buy four bags, use three of them and a refill, because a lot of balls are scattered around the litter around ;-). The beads can reuse it as they do not absorb odors.
In the bag is equal to an eyedropper included and a sealable container for urine sample. These should be used for good test results (without impurities) only once. The bacteria in the urine multiply very quickly, so you should be brought to the vet and within half an hour the sample.
The product is good, practical and delivers what it promises. From Stool carved (5 Stars) would me a slightly smaller size of the balls, as they so often function quite artificial and are not as likely to be used by the cats as normal litter is fine but several orders of magnitude. So we had the cat but a bit longer in the same room with this stray lock until they accepted these beads as the "acceptable alternative" to pee. But that is bleating at a high level. I am very thankful that there are these beads, one of our cats was so very helpful. Alternatives I have not yet found.