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I am planning on using 1/4" drip line with 6" spacing. Has anyone used this in their SFG? My main question on this is how deep should it be below the surface? Or should it be on the surface? Thanks.
I use 1/4" drip line with 6" spacing. I used the ones where there were 2 holes on either side of the tubing. This seems better than the laser drilled, which only has 1 hole. I space them 6" apart in the box. Not that you may end up doing the same thing as me, but in the excitement to finally have drip irrigation, I was randomly cutting the tubing such that there were instances where the holes were not lined up with the centers of each square, so I had to re-do them. Luckily, I left about 6" to 8" extra at the ends, so the lines didn't necessarily go to waste. But it's been great with the drip irrigation. I have a 30psi pressure reducer off the timer and further reduce the pressure with ball valves going to every two 4x4 boxes (I run 1/2" line from the source and from the main line, it splits to every two boxes; total of 6 boxes) so that I water for 7min and it gives good saturation of the MM in all 6 boxes. Oh, and I did not bury them in the MM. However, in spots where I mulched, it is under the mulch.
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