A common misconception is that microalgae consume more water than marigold flowers; that is, the water needed to produce 1 kg dry microalgae powder is 2–10 times less than needed by marigold flowers (Table 2). The microalgae process consumes more energy than that for marigold flowers. Acien et al. (2012) demonstrated that the equipment and its depreciation account for the lion’s share of microalgae cultivation cost. Assessing basic demands and choosing suitable equipment are very important tasks.