Dog Rocks are the natural and convenient way to keep your lawn looking beautiful and healthy. These 100% natural, Australian-sourced rocks can be simply added to your dog's water bowl to help reduce pet urine burn marks on your lawn, grass, and hedges. One pack of Dog Rocks is effective for up to 2 months, and won't affect the pH balance of your pet's urine. Dog Rocks are safe for your dog and other household pets and are easy to use - simply rinse the rocks before adding to your pet's water bowl and let them sit for 10 hours before they become effective. For best results, replace the rocks every 2 months and make sure your dog's bowl is their main water supply. With Dog Rocks, you should start to notice a change in your lawn's appearance within 5 weeks, and no new burn patches should appear.