The solution is generally slightly ventilated but may remain unventilated. If not aerated, the solution level is kept low enough to allow the roots above the solution to receive sufficient and adequate oxygen. A small incision is made above the tank lid specifically for each plant. There often tends to be more than enough plants for each tank. The size of the tank normally increases as the size of the facility gradually increases in size. You can build a homemade system with plastic food containers or you can also use glass jars with aeration to be provided by an aquarium pump, aquarium airline tubing and aquarium valves. Use clean, transparent containers that should be covered with aluminum foil, butcher paper, black plastic or any other light-resistant material, thus helping to eliminate the formation of any type of algae that may begin to accumulate and grow. Throughout the process the nutrient solution is changed according to a schedule, for example once a week, or when the concentration drops below a certain level which can be determined using an electrical conductivity meter. Whenever the solution begins to deplete below a defined level, renewed water or nutrients are added. A float valve can be recycled to regularly maintain the solution level. In raft solution culture, plants are typically placed in an area of ​​heavy-duty plastic hanging outside the nutrient solution. In this way the solution will never be able to fall below