that system is greentrees multiflow system, it uses 5gallon buckets and a solid unit, look into CAP's ebb and grow, it uses 2 gallons buckets for much less hydroton to clean and grow large plants anyway. you can pick it up from Plantlighting.com for $399, everyone else has it for close to $600, plus the performance of flood and drain in buckets vs. a tray is much better, the drainage causes more o2 into the rootzone, the growth on these bucket systems is very close to the amazing growth rates of aeroponics