Reusing home grey water in the yard & garden (Part 1) I first learned about gray water reuse from a documentary over 30 years ago on how NASA developed a natural system that can reuse water on long space travel or on labs on other planets. With many areas in a drought situation the collection of rain water is not enough to sustain a healthy garden or landscape. This is where the harvesting gray water comes in to play. Gray water is NOT water that has come into contact with feces, either from the toilet or from washing diapers. Gray water comes from showers, bath tubes & sinks. One obvious benefit to using gray water is saving water & money on your water bill. It increases the availability of freshwater for other primary uses. Gray water accounts for about 60% of the water outflow from homes. While grey water may look dirty, it is a safe and even beneficial source of irrigation water in a garden or landscape. Keep in mind that if grey water is released into rivers, lak