Rockwool medium dried out - What to do to fix?

So I came home today and found my mother plant extremely wilted. Quickly checked the rockwool medium and found it to be bone dry! I quickly flushed the medium out with nutrient solution to rewet it and have since foliar sprayed a bit with just plain water.

Is there anything else I should be doing? I plan on flushing a bit more since I figure rockwool that has dried is likely to have built up some salts. I guess I'm curious as to how screwed I am.

A little background info: I am using an ebb and flow system and had my plant in a 5x5x6 inc rockwool slab. I saw roots poking out from the bottom, enough for me to believe it should be transplanted into another container. So I "double" potted my plant into a larger pot and carefully cut out the bottom of the plant container. I placed that onto some treated hydroton. I had set up my ebb and flow so the water would come just to the bottom of the rockwool which it evidently isn't so. Thanks anyone that can help!

Get the container a little lower in the tray. check to see that your container fill hose hasn't come off the water pump. I had that happen and was lucky to have caught it quickly. I would oftentimes override my timer when checking up on the plants to verify tray was flooding and then cut it back on timer mode. Although it has nothing to do with your problem, I also found my airstones clogged from time to time, not putting out normal bubbles. I just replaced them. Cheap fix. Good luck.

Yea I lowered the container a wee bit. Turns out my timer had just stopped working; when I checked it it was 5 hours off. Unplugged and replugged it in and am checking it now to see if it's actually working or not. Thanks for the input!