Provides a feed of nutrient solution to substrate which drains back to a reservoir to be pumped back up in a continuous cycle. A complete drip system typically uses both a water/nutrient pump along with an air pump to help oxygenate the solution.

Top Feed and drip hydroponic systems provide a slow feed or drip of nutrient solution to the chosen substrate or medium which then slowly drains back to a reservoir where it will be pumped back up in a continuous cycle. A complete drip system would typically use both a water/nutrient pump along with an air pump to help oxygenate the solution in a reservoir.