I began with this idea some time ago. I can't find the original post.
This is a combination of several YouTube video's and like you see it is paying off well. Yes it is not without ground it's a solution in between hydroponics and ground.
This is for the ones who don't have a garden and people who don't want to be in the ground. Once every few days you need to refresh the water bottles. You filter it and put it back in the top. As you see it Pays off very well . A vegetable garden against your window. It is a natural sun shade and it cools your balcony also a bit.