Thanks very much @porters and the farming is 100% organic with me adding more compost and organic manure to the soil as months pass by. Our goal is to promote organic farming in these plastic bottles and i wish those replicating can do thesame.
The nutrients wash out from one bottle into the other and the good news is that you can collect all the liquid with nutrients at the end of the last bottle and use it to re-water the crops again and again. Check out this video i made that talks about the benefits of UPB Vertical Gardens: https://steemit.com/fundition-f31aejsby/@thegreens/59u9gl77