Looking for a pourable insulation

[cdestuck]

The way my house is constructed, I can pour insulation from the attic down into the walls of the second floor. There's a 3'' slot between each joist that I can do this. I did this way back when to one bedroom and now what to do the others. But I cant seem to find the pourable insulation. Back when I did the one room I used something called Dectatherm or something like that. Was small round Styrofoam like balls that was perfect for pouring down into the wall cavity.

Can anyone direct me to a manufacture of something along this way? Not really looking into blowing insulation or foam. Thanks

 

[joecaption]

I just Googled "pourable insulation for walls " and lots of sites came up.