Generally, vertical farming uses 95% less water than regular farming. Farm engineers have recently made and patented a dehumidification system allowing to reuse of water that farm plants evaporate during growth.

From 1400 liters of the water, plants only use 80 liters for weight gain (consumption of nutrients from a larger volume is a prerequisite). The remaining 1 320 liters the plants simply evaporate. In the process of transpiration, a lettuce leaf can evaporate an amount of water that exceeds its own weight many times. We collect this water with air conditioners and dehumidifiers, purify it and reuse it in production, maintaining the optimal humidity inside at 70%

How Ifarm Vertical Farms Save Water. Company. (n.d.). Retrieved September 22, 2021, from https://ifarm.fi/blog/2020/10/how-vertical-farming-helps-save-water.