1) All living things need phosphorus to grow. That’s why it’s a key ingredient in fertilizer. Phosphorus enters our body through our food and is stored in our bones. But whenever we go to the toilet, substantial quantities of this valuable and irreplaceable element literally go down the drain with our urine and feces. They end up on the bottom of the ocean, where they are useless. Meanwhile in 80-200 years from now, world phosphorus reserves are expected to be completely depleted. What then?
2) We flush our toilets with precious drinking water. The average toilet cistern has a capacity of 10 liters. It’s a waste to let all that water simply go down the drain!