CannaKeeper sorry I didn't get back to you sooner, work and X-mas shopping. I was researching an alternative medium for my drip system and read a couple of things about this new Bud Blanket. I figure all the Hydroton is doing is covering the roots from the light and providing some kind of base for the rockwool cubes, so the plant doesn't tip over when it gets large. Here is the product description:
The Bud Blanket is used in hydroponic systems that utilize a tray (flood & drain, drip, etc.). It works especially well when growing in rockwool blocks, but can also be used with net pots and other types of containers. Follow these simple directions:

1. Roll the pre-cut Bud Blanket out onto the surface of your tray.
2. Place rooted plants in rockwool cubes, etc. directly on the Bud Blanket.
3. Watch in amazement as the plants root system develops in the high humidity layer that the Bud Blanket creates!
4. Clean up is a snap! Simply roll the Bud Blanket up with roots and all and you're ready to grow again.

I figured there's not much to lose since it only cost $15 for a 48"x48" mat. I should be setting it up this coming weekend.