Check the listing for details. XerXes Recirculating Deep Water Culture RDWC Hydroponic System,5 Gallon. Condition: New. Listed at 134.99 USD. This XerXes hydroponic system is perfect for indoor and outdoor gardening. With a tank capacity of 5 gallons, it includes an automatic watering system that makes it completely autonomous. The recirculating deep water culture design allows for the perfect balance of nutrients and water for your plants to thrive. The system comes with a hydroponic bucket and 4 sites, each with a capacity of 5 gallons. Made of plastic and manufactured in the United States, it is easy to set up and use. Perfect for anyone looking for a low-maintenance gardening solution.This XerXes hydroponic system is perfect for indoor and outdoor gardening. With a tank capacity of 5 gallons, it includes an automatic watering system that makes it completely autonomous. The recirculating deep water culture design allows for the perfect balance of nutrients and water for your plants to thrive. The system comes with a hydroponic bucket and 4 sites, each with a capacity of 5 gallons. Made of plastic and manufactured in the United States, it is easy to set up and use. Perfect for anyone looking for a low-maintenance gardening solution.