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High-capacity polymer gelGradual and gentle moisture diffusion — ideal for avoiding spikes and maintaining constant humidity.
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Adjustable sliding grilleAdjust the flow from 0 to 100% depending on the volume of your humidor — from travel cases to large display cabinets.
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Refill with distilled water onlyUnlike sponge humidifiers, polymer gel refills only with distilled water — no propylene glycol solution.
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Pack of 2Two humidifiers for even coverage in large humidors or two medium-sized ones.
LINEAR CRYSTAL — polymer gel for smooth, consistent diffusion
The Linear Crystal is the gel humidifier for enthusiasts who want the simplest solution. Refills with distilled water only, adjustable grille, pack of 2. No complex solutions to prepare.
Polymer gel vs. Oasis foam — what’s the difference? Oasis foam is refilled with a propylene glycol solution and offers active regulation towards 70% RH. Polymer gel (Linear Crystal) is refilled with distilled water only — simpler to prepare but without chemical regulation. Gel is ideal for humidors that are already well-sealed.
Can I use tap water for the Linear Crystal?
No — use only distilled water. Tap water contains minerals that gradually clog the polymer gel and reduce its performance. Distilled water is easily found at supermarkets (in the household section).
How long does a refill last?
Generally, a refill lasts 2 to 6 weeks depending on your humidor's volume, its seal, and the season. Monitor your hygrometer and refill as soon as the humidity drops below 65% RH.
How do I activate the Linear Crystal before its first use?
Activation is simple. Open the humidifier and pour distilled water onto the gel gradually until it is well-expanded. Let it absorb for a few minutes, then empty and carefully wipe away any excess free water: not a single drop should bead, as water in contact with a wrapper can cause stains and mold. Close, install the humidifier in your humidor, and let the atmosphere stabilize before storing your cigars. Use neither tap water nor propylene glycol solution: polymer gel refills only with distilled water.
How do I adjust the Linear Crystal grille?
The sliding grille regulates the diffusion surface from 0 to 100%. With the grille closed, the humidifier diffuses very little; wide open, it releases moisture at the maximum level. Start halfway open, then adjust based on your hygrometer readings after a day or two: if humidity exceeds 72%, close it a little; if it stays below 65%, open it further. A small humidor or travel case generally requires a reduced opening, while a large humidor requires a wider one. Remember to readjust with every change of season.
Solo or Duo: which version should I choose?
The Solo version includes one humidifier: it is suitable for a standard-sized humidor or for replacing an existing humidifier. The Duo version includes two: ideal for a large humidor, where two diffusion points placed on opposite sides ensure more homogeneous humidity, or for equipping two humidors at once. It also allows you to have one humidifier ready for use while the other is being refilled. If in doubt, trust your hygrometer: if the humidity struggles to stay between 65 and 72%, a second humidifier is necessary.
What is the difference between Obsidian Black and Crystal Clear colors?
The difference is primarily aesthetic. Both colors rely on the same polymer gel, the same adjustable sliding grille, and the same distilled water refill: humidification efficiency is identical. Obsidian Black blends discreetly into a humidor with a dark interior, such as carbon fiber or dark wood. Crystal Clear provides a brighter touch, in harmony with glass, acrylic, or light wood humidors. Simply choose the one that best suits your humidor.
How do I maintain the Linear Crystal and when should I replace the gel?
Good maintenance ensures healthy, long-term humidification. Refill exclusively with distilled water: minerals in tap water gradually clog the gel. With each refill, observe its appearance. If the gel no longer swells properly, becomes discolored, gives off an unusual odor, or shows the slightest trace of mold, it is time to replace the humidifier rather than trying to clean it. Wipe the case and grille with a soft, dry cloth without detergent, as residues could be absorbed by your cigars.