Using the Reservoir Method

• The reservoir method is also known as deep water culture, or DWC. In this method, a container is used to hold approximately two inches of the water and nutrient solution in which the plants will grow. The plants are then placed into the container to float on top of the water. Before placing the plant containers into the nutrient container, punch tiny holes into the bottom of the plant containers, which will allow the plant roots to grow directly into the nutrient-rich solution.
  
  

Ensuring Proper Circulation

• An air stone should be kept at the bottom of the container to circulate and aerate the nutrient-filled water. Use the same type of air stones used in fish tanks.
  
  

Pros and Cons of the Reservoir Method

• The pros of the reservoir method of hydroponics are that, according to Simply Hydro, it is the simplest method to achieve hydroponic growth and it is also the simplest system to build using common household items. However, there is one drawback: At all times, light must be kept from making contact with the nutrient-rich water solution, so you must employ methods to block light, such as using light-blocking plastic planting trays to hold the plants and similar light-blocking materials to hold the solution underneath. If exposed to light, algae may grow in the nutrient-rich solution, which can hamper the growth of your plants.