Yep that is it.

This is what I was told to do and it worked.
The idea is that you keep the rockwool damp without letting it get saturated, just keep an eye. the roots will have started to grow out of the net pots in 3 to 6 days. and then you can lower the water. first to the bottom of the net pot and then to one inch bellow.

Nutes.
For the first couple of days (Untill you have a set of 3 prong leaves) I would keep the nutes at an EC of 0.3 then incresse as the plant gets bigger.

IF you can't get water witha n EC of 0, then be carefull, and just use a little nutes.
Good luck.