Recycled water and plant growth
The hypothesis that radish plants grow more quickly when watered with recycled water is proven to be true.
Recycled water can be used for many applications and helps to conserve our fresh water resources. It can be used in industrial processes, irrigation, watering public parks and gardening. In some countries like Singapore and in Orange County, California, recycled water is given a more advanced treatment and used as drinking water.
Try to repeat the science fair project using different types of plants. Observe if these plants react similarly to the radish.
The science project experiments can also be repeated to compare the rate of seed germination when recycled water is used.
Reclaimed water - http://en.wikipedia.org/wiki/Reclaimed_water
What is recycled water? - http://www.waterrecycling.net.au/content/what_is.asp
Basic safety requirements