H2OtoGro Hydroponic TOP FEED (Self-watering) Bubbler Complete kit # 3~16"x10", 4 site &hellip; All H2OtoGro products are made with 100% Food Grade materials and feature a garden hose adapter (an H2OtoGro exclusive) and starter supplies of grow medium and nutrients to get you started! Complete growing kit. Perfect for school projects or science experiment! Grow herbs, flowers, fruits and vegetables anywhereindoors, outdoors, counter top, office, tight spaces, etc. 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. Top Feed ~ 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. Water level indicator ~ Helps maintain the proper water level in the reservoir without lifting or removing the lid. The black out style reservoir and lid along with the blue color of the water level indicator help inhibit algae growth inside the reservoir.