I'm getting my hands into true aer growing and have a few questions. I'm building a system from a 52"x52"x7" container with holes drilled to accommodate neoprene pads. There will be a lot of holes drilled, 9 per square feet for sog growing. Nutrients will be pumped into a pvc pipe made into a square with maybe 2 extra rows in between making it a total of 4 rows with spray nozzles at 50 microns. It will then just drain down a drain hole. I'm not sure wether or not I want to drain to waste or recirculate. My question is how many spray nozzles I should use and what size pump? Also, what are some good spray nozzles and pumps for aroponic growing? Anyone seen or do a top feed system where the nozzles spray from the top to prevent the roots from clogging up the nozzles? Or how about a fool proof way to build it so the roots wont clog up the system?