Making it up as I go along. I've read about the different types and looked and a bunch of setups for inspiration. All the fittings I've created and printed with my 3d printer, including the 5 way connector for connecting to the reservoire. I've got 1/2" on the top and bottom, from the pump I have an inline fitting that only has a 5mm diameter hole for flow limiting. The pump is one I had sitting around, which turns out to be way overpowered. Currently it takes 5-6 hours before things overflow so I must be pretty close. I don't think it would mix well enough without a pump after the first fill. When I first filled this system I filled it with water and then mixed the res and turned the pump on. Only after a couple hours of running did the buckets and res finally equalize their ph and ppm. With it just sitting, it doesn't seem like there would be enough flow to equalize everything. With the RDWC, my understanding is that the circulated volume is a buffer for the nutrients and water. Instead of a plant living in 6 gallons of water, there is now 4 plants per ~40 gallons. The ph of individual buckets wont vary as much and there is only one spot in the system you need to check. With that single point you can also automate things like PH and PPM with some sensors and pumps, keeping the levels closer to optimal for a longer time.