It makes a good base for stones, but it is pretty nasty when it gets wet if left to function on its own. Think about jello - blue jello. You'll want to use something with larger stones mixed in. I'm assuming you are in New England, since I have not heard people in other parts refer to stone dust. The material that you would do better to use, in my opinion, is what is called "processed stone" in New England. It is basically a mix of larger stones all the way down to stone dust. It has more structure.

Geez... don't know what to tell you but the truth, Zec. We put in a stone path using large Pamona Sandstone with stone dust between the pavers a year ago. The stone dust has not hardened. It has compacted, but that washes away somewhat when it rains.. also weeds do crop up from the stone dust. It's kind of like brown sugar when it compacts,but it's not a solid kind of substance at all. I'd be curious to hear if anyone else has experience with this material. Molie

GardenWebber, The short answer is, yes, you can get it out. But it's going to take some work. One way to tackle it if your cushions are removable is to get yourself some big, thick garbage bags, go outside with a wet/dry vac, put the cushion in the bag and suck all the air out of the bag until the cushion is entirely flat as a pancake. You need a good strong vacuum to get it super flat. I'd use something like a ShopVac. You'll want to do it outside b/c you don't want to be bothered with the expense of the super fine dust clogging up a HEPA filter on a fancy vacuum. You may have to repeat the garbage bag trick a few times to make a dent in the dust. The problem with furniture is it uses fine cell foam as the cushioning material. That is the same stuff they use in the vacuum pre-filters to trap dust. So you're basically cleaning one big filter. Every time someone has sat on the furniture they have forced the dust deeper and deeper into the foam. It will take some work to bring it all back to the surface where it can be sucked away. For the rest of the piece of furniture, you're probably going to have to punt to some form of wet cleaning - i.e. 'steam' cleaning to get all the dust out. As a previous poster mentioned with the wet microfiber cloth for cleaning hard surfaces, basically you're going to have to make fine mud and suck it out. The trick will be to use a machine that flushes as much water through the fabric/foam as possible. I personally use a Hoover SteamVac for our furniture and dining room chairs. It would be a good place to start but it doesn't have the best suction. Remember you have to get as much water back out as possible and dry it quickly or else the foam will mold/mildew. Think of the drywall dust as embedded dry mud and that should give you a good handle on what it's going to take to get it back out. Wet cleaning is the fastest road to cleanliness for these kinds of issues. - IT Geek

I don't have easy answers for you short of hiring a specialty cleaning company to come in and do it for you. It's a huge job. Here's how I approached it -- maybe it will help you. First, if you're using your furnace, change out the filter regularly. Remove and clean draperies, pillows, throws, rugs, doodads, etc. You'll probably want to have carpets and upholstered furniture professionally cleaned. Every single surface and item needs to be cleaned, including ceiling, furniture, light fixtures, windows, walls and floors. Start from the top and work down. Keep rinsing out your cleaning rags and mops, and keep changing your vacuum filters. Good luck!