If you are building the 6" system, you will need to fit the chambers with internal spraylines. For this you can use 1/2" inside diameter flexible, polyethylene tubing or 1/2" PVC, if you use the PVC, you will need to add a 45 degree elbow at the access hole end - see diagram below. The spraylines are attached to the inside of the chambers with plastic "Zip Ties" which are fed through a small hole drilled into the chamber and then wrapped around the spraylines and passed back out through the same hole - see diagram. You will want to secure them as high up as possible but not so that they interfere with the placement of the grow cups. You will need to run the spraylines the entire length of the chambers and at each grow site, drill a 1/16" hole so that they will spray down directly under the grow cups. Plug the opposite ends of the spraylines with either a PVC end cap or silicone sealant. See picture below of sprayers in action.
If you are building the 4" system, you will see by the diagram at right that the sprayer is located on the opposite end of the chamber from the drain. This is because you want the nutrient to flow from the sprayer to the drain. Since the 6" system has a spray hole at each grow site, the drain and supply end of the sprayline can be at the same end of the chamber.
You will want to use plenty of silicone when installing the drain fittings - see diagrams. You will need to find a piece of tubing to use as a level adjusting standpipe within the drain fittings. It should fit snugly inside the drain fittings and maintain the nutrient level for at least a couple of hours in the event your pump stops working for any extended period.
The pictures at right depict the proper workings of the spraylines in the 6" chamber and the sprayer in the 4" chamber (far right). Notice the strong spray is creating significant aeration of the solution. This is key to the system's operation.
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