Now every male has been caught short before and had to go for a pee in the bushes but this filtration system makes is so instead of harming the plants we can end up watering it. The system, called When Nature Calls, is in the concept stages but the idea is that the urine will be filtered through charcoal, crushed limestone and greensand before it reaches the plants. This means the plant gets a much needed drink and we think we’re saving the environment. WIN WIN in my book!!