This bowl, which is large for me, doesn't even dent the crop. I pretty much have to eat salad every day to keep up with the growth from just this unit. It could feed a non-vegan family of 4, a 3 times a week.
All soil is recycled continuously. I don't need chem fertilizer because the organic/compost based mix is enough to feed these plants for the short term. When done, I put all the used soil to the weather in large pots to compost any roots and such that may be leftover. Once it's all clear, I amend and start over.
Once the soil gets too broken down or begins to get 'swampy', I use it for outdoor container projects such as sweet potatoes, and other veggies with low fertility requirements.
This is the time of year I used to have to completely shut down my outdoor garden for the bugs and humidity. I would basically stop eating enough vegetables because of the comparative let-down with shipped in produce. Fruit not yet ripe on the outside, but rotten at it's core, from being harvested way too early. Wilted beets, and greens, with the exposed parts being pretty much waste. Then, the worry with what poisons are on, or worse in the commercial offerings.
It's nice not to have to wash anything. I give it a rinse and spin and that's it. This is very easy (foolproof, really) to do. I offset the cost of electricity by turning off everything else like the water heater. My electric bill has not gone up very much. I would otherwise spend $60-80/wk on produce if trying to buy organic.