Complete Hydroponic System SELF-WATERING DWC Bubbler Kit # 4-4 H2OtoGro Complete growing kit, even includes starter packs of nutrients & grow mediums to get you started! Just add sunshine. Self-watering ~ Oxygenated, nutrient-rich water is constantly provided in a slow drip to each plant by drippers. The roots are suspended in the reservoir beneath the net pot and constantly watered with and bathe in an oxygenated, nutrient-rich solution throughout the entire grow cycle. Oxygenation ~ Provides plants with highly oxygenated and nutrient enriched water that circulates below the plants for the best results and minimal effort. This oxygenation helps increase plant growth and speeds plant development. Plants can grow faster and larger in a DWC Hydroponic system compared with soil grown plants. Made with 100% Food Grade Polyethylene! Water level indicator ~ Helps maintain the proper water level in the reservoir without lifting or removing the lid. The blue color helps inhibit algae growth.