The rubbermaid container is 16" deep. I would think any container would work. As long as the roots have plenty of fog. The plants on the edges might not have been getting enough fog because they were near the edges of the container. The net pots were placed 2 inches from the edge.

Being a newbie, I mixed the nutrient 100% strength. In the beginning I used GH dry nutrients for leaf growth. I have since switched to liquid GH 3 part and calmag plus per Zandor's wisdom. Fogging manufacturers recommend 50% strength. The ultrasonic fogger I used (from Walmart) warned about not adding ANYTHING to the water. They also add a demineralization cartridge to the unit. After two weeks I bailed. The plants were not doing as well as the ones I grew in dirt. The plants just sort of sat there and didn't grow.