GET OFF Crystals can help keep cats and dogs from repeat fouling any outdoor areas, flowerbeds, doorstep, walls, fencing areas. These jelly-like crystals are highly effective in all weather conditions, even after rain. One application can last up to 8 days depending on how quickly the crystals biodegrade. Applied repeatedly over a period of weeks, the odour of the GET OFF Crystals will help 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 children's play areas, sand pits and climbing frames.