rock wool as good as mineral wool?

Hello, I have no chance to get mineral wool for hidro grow. So is it ok to use rock wool? And could someone link me to some video how to - hidro,..wool n stuff?

Thanks a lot!

Did you try google or youtube first?

Rockwool is pretty standard hydro protocol for many.

Should it be in cubes? I mean strong.. Or could it be fluffy, becauze I have left some from times when I used it as heating material for my garrage..

Rockwool and mineralwool are the same thing; my understanding.
they are both made form liquifying rocks/minerals and spinning/blowing them...think cotton candy.

For the purposes of hydroponics it is desirable to have a "relatively" dense product becuse one of the mIn reasons for using it is for structural stability of the plant.

You indicate that you have some insulation leftover...it could work.
If I were going to try it I would compress it "moderately" and use my best judgement on stability and also porousity (I know, not a word, prolly)....water needs to be able to wick and evaporate through it.

I use rockwool cubes that are like 2" x 2" for my clones and they are pretty dense and they fit pretty snugly in my netpots.

Experiment, man..that is what it is all about!

I use 4" cubes for SOG grow testing of strains, before I run them "full size" and I couldn't be happier with it.
Go to the Grodan 101 page on how to use it!

Link here:
http://www.grodan101.com/