VIVOSUN Hydroponic Site Grow Kit Hydroponics System 36 54 72 90 108 Plant SiteseBay Food grade PVC U PVC pipes with ample space for vegetables, flowers and plants. Conserve Water and Nutrients Water pump Included Note: When the pump is working, the water level should be high enough so that the pump is always immersed in water, otherwise the pump will dry out and be damaged. 36 108 Sites 4 3 Layers Soilles Cultivation 36 108 Sites Hydroponic Planting Kit. Each PVC pipe is 1 feet long and 1. 26 inches (3. 2cm) in diameter with