Donnie you may want to think about an aerocloner with the setup you have you will have better luck and greater success if you get rid of the Rockwool all together and just use an aerocloner and then transplant your rooted clones to the grow rocks.

Yes you can reuse your grow rocks I have for years. You do need to wash them out each time and treat them with a mild bleach to clean out the pours holes of all the toxic salts. I have a cement mixer with a shit load of holes in it for drainage and it does the job easy and clean.