STYEM+fair+ideas


 * Gray Water Recycling**

Only **3%** of the water in the world is fresh water, which makes it an important and rare resource. This is why we need to conserve it when possible.

1. Is gray water safe to use on plants? 2. Does the growth rate change when gray water is added occasionally, instead of using only fresh water? How does the growth rate change when using only fresh water, only gray water, or a combination? 3. Can a plant sustain on gray water alone, or does it need to be watered with fresh water as well? How often?
 * Questions:**