I'm planning an NFT system and could use help.
I'm planning a NFT system for lettuce and herbs using 3 inch PVC pipe and 2 inch net pots with 1.5 inch rockwool cubes & hydroton to cover. What's the optimum size holesaw to use when drilling into the PVC? Since the net pots will be going into a material that is round, I'm guessing something smaller than 2 inches would be ideal, but what size?
Also, instead of having the nutrients drain down the end of the PVC and down an elbow, I'd like to put a cap at the end of the PVC run and have some kind of drain on the bottom of the PVC. I'm looking for something that will accept possibly 1/2 inch or 3/4 inch PVC risers to raise the water level to the bottoms of the net pots when roots aren't yet long enough, then remove the riser when the roots have grown long enough. Whatever this threaded piece is, it would have to make a good seal with rubber washers against the bottom of the PVC so that there aren't any leaks. I'd seen something like this on a youtube video, I just don't know what it's called and can't find the video again. An alternative would be to start the seedlings in a deep water culture method until the roots are long enough for an NFT system, but that doesn't seem to make much sense to me.
BTW, I intend to grow everything outside and I'm open to any criticism or something I may be overlooking.