"As far as the PVC rings, it's something that is unique to the system because as far as I know you can't buy PVC with that curvature in that size"

Took three seconds on Google on the term "Curved PVC pipe" to find three Chinese manufacturers. Also, taking a straight PVC pipe, heating it to 160F, and gently wrapping it around a 55-gallon drum is pretty simple to do.

As a hydroponic systems engineer, I have to agree with shake, there's nothing in that system to warrant the price. A multitap transformer with a selector switch can be had for $50 for 1000, 750, or 600w operation. The water pump, at 27GPM, could be found at a Home Depot for $30-50 for use in outdoor ponds or as high speed sump pumps. The sprayers, those are a dime a dozen.



There's one of mine. Shed, automated controls, filters, monitoring system, everything included.