The mix ratio of PG to water makes no difference. PG's release/absorbtion point is 70%.
A 50-50 mix is just a good general ratio to go with. You want to have enough PG in the mix to enable it to do it's job and the same with the distilled water.
Here comes Cliff Clavin.....sorry guys.
PG works by forming a layer surrounding the water in the humidifier's element. When the rh in your humidor goes below 70% the PG allows water to migrate to the surface of the PG layer. It evaporates increasing the rh. When the rh reaches 70% the PG cuts of the water going to the surface.
It's just coincidental that PG has a release point of 70% rh. But a nice coincidence!
PG hangs around for about a year. It does evaporate very slowly. So you should recharge your humidifier's element with a fresh solution every few months. In between, just adding plain distilled water is OK.
PG is odorless and tasteless and won't harm your smokes as long as you don't get it on them directly of course!
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