I'd like to clear up some misinformation. This is important and it could very well impact the success of the grow!
1. Dunking and draining is the single best way to grow roots, which is the absolute most important thing we can do in veg.
2. Directions and even a video are on my website
How we water
3. Pouring water down the top will actually waste more product than dunking, because in order to saturate the medium with no dry spots you'll have to pour and pour and pour.....That's why we dunk!
4. As we drain the container after the dunk, the liquid leaving the bottom of the container draws in fresh air from the top......roots love this and we love roots.
I'm not sure where the "fresh water only" thing started, but that's not what I do. Initially, you want to use Transplant upon planting the clone or seed. Then, when the plant has 5 internodes....no later....could go earlier....start with the drench cycle.
If you find a coffee can or a bowl, so that the container sits about 3/4 under water, you can dunk with minimal waste and maximum effect.