GET OFF My Garden Crystals can keep cats and dogs from fouling any outdoor areas, doorstep walls, fencing areas. These jelly-like crystals are highly effective in all weather conditions, even after rain. One application can up to 10 days depending on how quickly the crystals biodegrade. Applied repeatedly over a period of weeks, GET OFF Crystals will condition the cat or dog to stay away from treated areas. Ideal for use on lawns and borders, and for protecting newly-bedded or delicate plants. They can also be used to keep pets from fouling childrens play areas, sand pits and climbing frames.