Well,
@CigarStone triggered another of my OCD rabbit hole adventures. I did a ChatGPT search of info on silica gel beads, and a lot of Googling. Here's what I came up with.
There are three types of silica gel beads, Type A, Type B, and buffered. Type A works in lower RH regimes, where you want things to stay dry. Type B are probably the beads Cigarstone bought and work in the cigar range of RH. Neither will desorb--give off water, they only adsorb. However, after being conditioned, apparently they stop adsorbing at a set point that they take after a prolonged period of being held at a specific RH. So while they won't push moisture back into the system, they will stop drawing water out of the system.
I do what Cigarstone does, instead of misting them I put a small dish with a paper towel or small sponge with distilled water into the system to raise the RH a bit, and if your system is well-sealed, it will stay there for an extended period of time. The third type of bead, one brand name I've come across is Art Sorb, apparently can go both ways, adsorb and desorb, but they are buffered somehow and are more expensive. Those types of beads
MAY be what Heartfelt and RH Shield market, I don't know.
What I do know is I've probably conditioned the beads in my wineadore over many years to stop adsorbing at a certain RH. I put a couple of 250 cigar tubes of RH Shield in the new Craigs List fridge I recently put into service. I have a ton of spanish cedar drawers in the wineadore and they create incredible stability, I rarely have to add water to it. I have less experience with the new fridge and while there are some cedar trays and boxes in it, there is nowhere the amount of wood in it that is in the wineadore. Here is a photo of the two.
I do not plug either one in, since it is always between 60-65* F in my basement, year-round, so no jinking around with a condenser blowing cool air around inside them. You can see the two RH Shield units in the lower fridge. I have not opened either door for 3 days, and my SensorPush units tell me that the top wineadore has fluctuated only +/- 0.1% RH and the lower unit only +/- 0.2% RH over those 3 days. Not a long time to be sure, but they both seal very well, apparently.
I'm not sure buffered beads are necessary, and if you have a well-sealed coolidore or large sealed plastic containers (or fridge units like mine) I bet Cigarstone's conditioning process for his generic Type B beads will work exceptionally well. I have no idea how units in which you actually use the cooling function will affect all this. But my fridges are apparently as well-sealed as a good coolidore or large plastic sealed container.
If you are lucky enough to have a stable temp basement like I do in Pennsylvania, and well-sealed containers, Cigarstone's method is probably rock-solid and there may be no need for buffered beads, so no need to fret over the loss of Heartfelt Industries as a source. If they did, indeed, use the Art Sorb (or generic buffered beads), I suspect RH Shield is pretty much the same thing. But if I ever need another coolidore or other container I can keep in my basement, I'm definitely using Cigarstone's method. His 15 year experience with his beads certainly prove this works. I'll never buy commercial products like Heartfelt or RH Shield again.
Google conditioning silica gel for artwork rather than for cigars for more information on the subject. And this source disagrees with my ChatGPT research in that they say Silica beads can both adsorb and desorb, whereas ChatGPT said unless the beads are buffered, they can only adsorb.
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Whether it can do both or only one, I sure don't know, but I do know I've used only beads in my wineador for about 6 years and very rarely have to introduce water into the system, on the order of every several months or so. It's incredibly stable. If you have a large cabinet style humidor, you're going to need a more complex electronic system, I'm sure, but for stable environments like coolidors or large tupperdore type containers or my fridges where I don't plug them in, beads are a perfectly adequate solution, and I'd have a lot of confidence in Cigarstone's method. My guess is the beads that have been in my wineadore are very well-conditioned, serendipitously, because I sure as hell knew nothing about all this when I set it up.
Many thanks to Cigarstone for this. I'll post back how often I need to add water to these fridges over time, but they are pretty rock solid right now.