SAVE YOUR LAWN - Vast improvements in 3-5 weeks, Dog Rocks, alongside proper lawn maintenance, will help stop those unsightly urine burn patches ruining your luscious green lawn and shrubs HOW DO THEY WORK - Dog Rocks act like a filter to help purify your dogs drinking water by removing some nitrates, ammonia and harmful trace elements which is what causes your lawn to burn SAFE FOR ALL HOUSEHOLD PETS - As you are not medicating your dog in any way, it is safe for all pets to drink from the water they are in ALL-NATURAL SOLUTION - The only 100% natural and hassle-free solution to urine burn marks on your lawn and shrubs, Dog Rocks are naturally occurring paramagnetic igneous rocks which can only be sourced from a particular area in Australia PROVEN - With over 1 million dog owners now using Dog Rocks worldwide, they have proven to be an effective way of preventing urine burn patches on their grass