We make three different types of Humidipaks – Maintain, Restore, and Absorb.
Humidipak Maintain Packs are not intended for dehumidification in high-humidity environments. Though they are a two-way humidification system, which does allow them to both absorb and release moisture, if your instrument is already over-humidified, the packs aren’t intended to remove large amounts of moisture from the instrument.
Humidipak Maintain Packs are designed to maintain a humidity range between 45%-55%, but they can only do this when the case and guitar have been pre-conditioned to those levels first. If the environment already has high relative humidity, Humidipak Maintain Packs won't be able to lower the humidity to that optimal level. For optimal performance, please use Absorb Humidipaks to reduce the rH in your instrument/case first before switching to maintain packs. This will allow the Humidipaks to maintain the 45%-55% range by releasing and absorbing small amounts of moisture at a time.