I am still working on a salt-only solution for this but I did find something on the topic:
https://www.teaforum.org/viewtopic.php?f=63&t=177&start=45
He is using sugar which I am trying to avoid based on one of the patent documents on the Boveda page:
Quote:Some Sugars may be Suitable. Sucrose is Suitable, but works at a slower
rate than Salts. Glucose and fructose work well for disposable pouches.
These two Sugar Solutions work for five to ten cycles.
It is certainly easier to do this than figure out the salt ratios (I have a working 68% solution of just salt and vegetable glycerin but that is a sugar so there is the "cycle" limit).
I might just say to hell with it and work with sugars+sodium chloride. It's not like it costs anywhere near $6 to make the pack but I am aiming for something long term rechargeable I can just swap in and out of the humidor as they get dehydrated.
Another interesting thing that is suggested in the above link is to the use of the mail packets as a material for only allowing water vapor through so I am tempted to try those as these packing air pillows are a bit thin and less puncture resistant. Cigars daily has been featuring one of the Boveda guys in a few of his videos lately and in the first they literally cut open a boveda bag and if they are using Hytrel as suggested in the patents then that stuff looks pretty stretchy and durable. I am not overly worried about dropping, breaking, puncturing, etc of the air pillows but it would be nice to have something less vulnerable.
I will leave you with the water xanthan gum ratio I decided on. It is doing the job of keeping salts from settling in the bottom perfectly:
Water Solution:
1500G Distilled Water
20G Xanthan Gum
I shook it up in a gallon jug as that has plenty of air room to help break down the Xanthan Gum. It is best to add the Xanthan Gum and give it a few good shakes then leave it sit for an hour and shake a few more times every hour. The Xanthan Gum likes to clump together like flour in water but the clumps eventually reach a saturation point that you will get a good mix.
If you got kids, you could add green food dye to it and it would be the perfect green slime. Probably should add the dye to the water before the Xanthan gum though.