Dog Rocks are a NATURAL rock. When placed in your dog's water bowl, they will help stop burn patches on your lawn or plants caused by urine from your pet.
Nitrates are the chemicals that burn your grass.
Dog Rocks are a paramagnetic igneous rock. When this type of rock is immersed in water, the paramagnetism creates a magnetic field within the water causing a change in the ion exchange.
This in turn diminishes the nitrates that are found in the water so your dog absorbs less nitrates into his system and therefore less nitrates come out the other end in his urine.