A while ago I made following post: How I built those amazing Kratky containers from protein powder jars

If you don't know, what the Kratky method is, here's the description from Wikipedia: https://en.m.wikipedia.org/wiki/Kratky_method

Those containers shown in the how-to have been in use for a few months by now, and my weed has started pre-flowering.
Two plants at once are now very hungry and thirsty, but they're growing like crazy and show absolutely great root health!