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In addition, this product is more effective because it maintains the maximum humidity to 70% or to the absorbent if too high or by diffusing more moisture if too low.

For those that hassle to maintain 70% as was my case with the simple distilled water I recommend the duo: Xikar Crystal Humidifier + Xikar Propylene Glycol Solution.

It'll just find a place with a relatively stable temperature between 18 ° and 21 ° C, 20 ° C being the ideal.