How does Music Sorb work? Music Sorb is NOT just a typical desiccant that dries the air when humidity is high. Music Sorb in addition has a special technology that releases moisture when humidity is low, that would otherwise dry out your wooden instrument. How much Music Sorb will I need for my piano? Two cassettes (upright pianos) or two pouches (grand pianos) are required for most environmental conditions. Some larger pianos or pianos kept in extreme humidity environments may need more Music Sorb. What is the ideal RH% for my musical instrument? 40-60% relative humidity is a reasonable range to preserve the integrity of your wooden musical instruments. How often should I replace my Music Sorb? Music Sorb should be replaced at least once a year to retain the effectiveness of the product. In climates with extended dry or humid seasons, Music Sorb may need to be replaced more often. Can Music Sorb be harmful to my musical instrument, myself, or the environment? Music Sorb is an inert and solid silica bead product. It does NOT contain excess water or liquid gels that can damage your instruments, even in the unlikely event of the packaging getting damaged. Music Sorb is nonreactive and gentle to the wood in your piano and/or stringed instruments. Unlike many of our competitors, Music Sorb is environmentally safe and does not contain any corrosive or toxic chemicals. Music Sorb however should still not be eaten and should be kept away from children and pets.