Ebb & Flow is a cycling technique that is known for its simplicity, reliability of operation, and low initial investment cost when compared to the other hydroponic systems. The nutrients are allowed to drain into a reservoir where they will remain until the next cycle. This cycling allows the roots to dry which prevents rotting and allows the roots to get oxygen. The Ebb and Flow technique is a simple operation, a pump provides water to the grow tray until the overflow is reached. Once the pump shuts off, the nutrient solution will trickle back into the reservoir where it will remain until the next cycle. Without good filtration the system can be prone to blockages, which can result in a ruined crop.