GMSgrowsanswered grow question 4 years ago A good DIY rdwc. 5 gallon pales, net pots for the tops, drill hole near the top for a water feed line pumped in from the rez right beside the root system, 2 inch holes in the bottom of the pots for grommets and pipe it back to the rez. Pump air into each root zone and air in the rez, keep your water down under 68 for maximum amount of dissolved oxygen that water can hold and you have the best system going