Step 6Install Feed Lines
Drill two 3/8" holes just above the media on opposing sides (lengthwise) of each of the media-filled boxes. Pass the tubing through the first hole and feed it out the other.
In this system, the irrigation and drain tubes are on the same side. On the opposite side, you'll need to have 3" extra of poly tubing so that you can bend the tube back on itself and secure it with a cable tie, making them leak-proof.
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Oh, and I think you meant "evaporation"?