The solution you bought is pre-mixed at 50% PG and 50% distilled water so you are all set there. The way to use the stuff is to soak the foam with the PG solution. Then you use straight distilled water for the next couple of months because the PG will still be there in a high enough concentration to work, then once you start noticing strange, wider changes in RH, you again add the PG solution to the foam and repeat. That 8 oz bottle could last you two years or so.
Honestly, you don't need the stuff. Straight distilled water will be fine, you just have to monitor it yourself.





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