Hope this isn't silly, but how do you all do a rez change with DWC if you have wiring over the plants or have them tied in scog? Wouldn't you have to dismantle everything each weeK?
If you DWC has a plastic top like a storage bin type, take 4 pieces of wood, miter them and make a border around the top of the plastic lid, then connect some rods to this to hold up your screen so you can move the screen, hydroton, plants, etc, all at the same time.
When I done DWC, I rigged mine with a controller bucket, and changed nutes etc through that. Very easy to make, and made changing the rezy as easy as plugging in the water pump.
Oh yeah, a controller bucket also makes running more than one DWC bucket a lot less work also! Any questions on this, PM me. I'm more than happy to share what I know