Advertisements: The ones I I'm questioning are in the pictures. Now I've got my materials for building a pit. Am for back dusting etc. Using huge snail fan for drying. But whats the best method? Back dust, apply appropriate solutions, agitate, flood, drain and remove excess water.....??? Sorry won't upload all pics. Ones I'm wondering about are.... 1 is 100% wool, cotton backing. 1 is 100% polypropylene, wilton construction. The wool with cotton backing? What's going to work with it? I'll assume it has the potiental to shrink/curl etc All advice welcome.