Dog rocks are a no-fuss, highly effective solution to those unsightly brown burned patches on your lawn caused by your dogs urine. A thoroughly safe treatment, Dog Rocks wont break down and release any minerals into water or change the urines pH, instead, the porous stones simply absorb and remove the harmful lawn burning elements from your pets drinking water, making them suitable for all breeds of dog.DirectionsFor lush, green grass and thriving hedges, simply rinse the stones before placing them in your four legged friends water bowl, and try to make sure your dog refrains from drinking out of puddles and ponds! Each 200g pack of Dog Rocks lasts for approximately two months and comes with a sticker to put on your calendar to remind you when the stones need replacing!