"What I mean, is that if you do pre-treat it, how exactly do you accomplish this?"
You need to soak your rockwool in p.h adjusted water.Adjust the P.h to 5.5 then leave it overnight.When you come back in the morning,re-adjust it,give the solution a good stir and leave for a further hour.
"or,
You just don't worry about it and tend to the water."
No,you'll need to adjust both the rockwool and all solutions to be ran in the system.Add your nutrients to the water first and then adjust the p.h.Imo 5.5-5.8 for growth and 5.8-6.2 for flowering are optimal fiqures.Although as a general rule you'll have no problems between 5.5-6.5,and a little drift is no bad thing.
P.H levels will drift as the plant absorbs nutrient and water from the solution so be aware that further adjustment is required if you are running a re-circulating system.
"Oh ya do you transplant when roots star showing or can you wait untill the plants start to show signs of stress?
When are you sopose to transplant?"
Well,when to transplant is to some extent dependant on what system you're running but generally you should transplant when you see roots comming out of the 1inch rockwool cube.
Finally;check st0neys thread on p.h at the top of this forum to see how p.h effects different nutrients uptake.
Hope this helps,
dev
