NONE.
【DWC HYDROPONICS SYSTEM INCLUDE】2Pcs 5-Gallon Buckets, 8W Air Pump, 2Pcs Air Stone, 2Pcs Top Drip Kit, 6M Air Tubes, 2Pcs Visual Water Level Indicators, 4Pcs Check Valve, 2Pcs Air Flow Regulator, 2Pcs Clay Pebbles.
【POWERFUL AIR PUMP】Voltage:110V/60HZ, Power:8W, Pressure:0.02mPa, Max Airflow:4*63.4GPH.Using with high-quality air stone can produce more air bubbles, It is the plant roots that get more oxygen and thus grow healthier.
【WIDE RANGE OF APPLICATIONS】Mars Hydro DWC hydroponic system is very suitable for planting flowers, vegetables, fruits and more. It can be applied to grow tents, indoor room, gardens, etc.
【SCIENTIFIC DESIGN】The drip irrigation watering ring can replenish water to the root system during the plant growth stage; the air flow regulator can control the drip irrigation water flow; when the bucket is short of water, the visual water level indicator can be found in time.
【MARS HYDRO AMAZON SERVICE】Quickest FBA Shipment Speed +100% Satisfactory Seller Solution+30 Days Hassle-free Return + 1 Years Warranty of Air Pump =Happy Purchase, any problems will be responded within 12 hours!