Uh, I've no knowledge about this stuff as an insecticide but why do you need an absorbent? Do you have a muddy run from all the rain or something? If you're trying to manage that then using this stuff is way, way too expensive. Try sand. Plain old sand. Sand drains very quickly and won't get all muddy. You'll need about three inches of inexpensive creek sand over your entire run. You won't need to buy the expensive white sand. Just ask for the least expensive sand they have at a landscape supply yard. We can get it here in the Carolinas for about $25.00 a ton plus shipping, which may be more expensive than the actual sand. For an 8'X12' run for example a full ton would be plenty. Make sure you have some way of enclosing the sand so it won't get washed away in a heavy rain. You could use bricks or landscaping timbers lining the inside of the run to keep it in.
I have an 18'x21' run with my coop in the middle and my Gals stay nice and dry. Every few days I go out with my hoe and turn it up which turns down the poop. Keeps things clean and dry. It also brings up worms and bugs which the Gals love. Now they fight over who gets in line first behind me when they see me coming with my hoe in my hand. The added benefit is that in the spring I'll remove about a third of it and put it in my garden and replace it with fresh sand. Doing that once a year will keep everything a lot cleaner and a lot less smelly.
I have an 18'x21' run with my coop in the middle and my Gals stay nice and dry. Every few days I go out with my hoe and turn it up which turns down the poop. Keeps things clean and dry. It also brings up worms and bugs which the Gals love. Now they fight over who gets in line first behind me when they see me coming with my hoe in my hand. The added benefit is that in the spring I'll remove about a third of it and put it in my garden and replace it with fresh sand. Doing that once a year will keep everything a lot cleaner and a lot less smelly.