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ULTRAponics Drain - $4.95

One ULTRAponics Drain and one Fill is required for each DIY GroTube hydroponic system if you plan to use the Flood or Flood/Drip Method of hydroponics. If you don’t want to use the Flood Method and will only be using the Drip Method, you don’t need this Drain, but will need one Fill to drain the nutrient fluid back to the reservoir. It sounds a little counterintuitive, but this taller Drain allows the nutrient to fill (flood) the hydroponic system to a precise level within the GroTube and, then, drain it after it reaches this level.