sentences:  In fact, they are the cleanest plants possible because there is no environment variable and the dirt in the food supply is extremely limited.Hydroponics also saves an incredible amount of water; It uses as little as 1/20 the amount as a regular farm to produce the same amount of food.The water table can be impacted by the water use and run-off of chemicals from farms, but hydroponics may minimize impact as well as having the advantage that water use and water returns are easier to measure.