soundta wrote:Great point on the foam it just leads to problems.
If you go to the craft store, it's cheap, and buy the wet oasis foam and keep an eye on the block and replace it every 3-4 month or more depending on how it holds up with active humidifiers the foam works just fine, just more effort to make sure it doesn't start to get funky on you.
The key is to saturate the block but no standing water. In the early stages new foam actually freshens and filters the air in the humidor.
I used the foam in both my large cabinet sized Oasis unit and smaller units for 15 years with no problems. Distilled water ONLY, the kind that specifically has no sodium in it and some glycol in the mix the first time you wet the block retards mold or mustiness very well, you just have to keep up with it.
With passive humidifiers the foam is a terrible moisture medium, it can mold in a matter of just a few weeks depending on how wet and the temperature.
All the opinionated and rabid anti foam crowd will say different but if done right it works, first hand experience over many years.