This Hydrofarm RS5GAL8SYS Root Spa hydroponic system is perfect for growing plants in a water-based environment. The system includes a total of 8, 5-gallon bucket sites, allowing you to grow multiple plants at once. Each site includes a black bucket, which is durable and designed to resist cracking. The system also comes with a 5-gallon reservoir, which is used to provide nutrient-rich water to the plants. With a tank capacity of 8 gallons, this system has plenty of room to grow your plants to their full potential. The black color of the buckets helps to keep algae growth at bay, ensuring that your plants receive only the nutrients they need to thrive.