This hydro-gel 2 oz jar is a two-way (both active and passive) product so it will maintain 70% humidity with zero chance of over- humidification. It contains amazing super absorbent polymer crystals, pre-charged for your convenience. Just remove the lid, exposing the moisture regulation cap, and THE SENTINEL will immediately start keeping watch over your cigars. There is no guesswork with this jar. When the gel level decreases to the ADD line, add THE SOLUTION to the FILL line. Done.