are all the dry packs like this or similar ? http://www.airgunbuyer.com/ecommerce...0Dry%20Pac.jpg
we used activated alumina n our air dryer in the compressor place i worked at . we used to go to -40 dew point but it can go way lower as much as -100 i think
https://www.deltaadsorbents.com/acti...umina-f-200-18
i have a bag of it here . just a safety specs sized bag (the bag is from a pair of safety specs) i got some for a friend to use in his air dryer in the workshop but he did not use it so gave me it back .
once it stops catching the water you put in in the over to dry off then reuse it .
from what i read the hills pump dry pack stuff cant be dried out and re used .
not sure if it would work in the airgun pumps.
EDIT
found this http://www.network54.com/Forum/79537...y+Pac++testing