How long do you soak the sponge in the planet wave gap guitar humidifier? The sponge doesn't seem to soften.

It takes about 30 mins. But put something over it to make sure it is completly submerged in water.

How much water do you add?

I squish it around under the faucet until it's completely saturated, then shake off the excess drops so it won't drip I side the guitar.

any reason not to use for a classical guitar

These are the only humidifiers I would use on my classical guitars They are good! Just make sure you wet the sponge with purified water (you can buy at every grocery store) and not sink water as the minerals will cause the sponge to mildew

Can you hang the guitar on the wall with this in it?

You could, but it wouldn't be very effective. I keep mine in a closed hard case and am able to maintain the humidity level around 50 in dry west Texas. It's dryer in winter. I have come to the conclusion that the only way I can hang, or leave my vintage acoustic guitars out on stands or hanging is in a humidity/ temperature controlled room. Until then it's in the case with one of these soundhole humidifiers.

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Acoustic Guitar Humidifier Pro

Product ID: 275201641

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Details

Brand
D'Addario
Special features
Adjustable
Colour
black
Capacity
20 Liters
Operation mode
Manual

⏳Extended refill intervals

👀Quick status check stopper

💧12x water absorption sponge

Description

💧 Keep your strings singing with perfect moisture control!

HYDRATE LIKE A PRO - Specialized sponge holds 12x its weight in water for ultimate moisture retention.
LESS FUSS MORE PLAY - Enjoy longer intervals between refills—keep your guitar performance-ready without constant upkeep.
LIGHTWEIGHT COMPACT - At just 58g and sleek dimensions, it fits seamlessly inside your guitar without adding bulk.
BUILT FOR SERIOUS MUSICIANS - Crafted with hydrophilic sponge material designed specifically for acoustic guitars, ensuring optimal wood health and sound quality.
STAY IN TUNE STAY CONFIDENT - Innovative stopper lets you check humidity status without removing the humidifier—no interruptions, just pure flow.

The Acoustic Guitar Humidifier Pro features a hydrophilic sponge that absorbs 12 times its weight in water, significantly extending the time between refills. Its smart stopper design allows quick humidity checks without removing the device, ensuring your guitar stays perfectly hydrated and protected. Lightweight and compact, it’s an essential accessory for maintaining your instrument’s tone and longevity.

Specifications

Item Weight	58 g
Product Dimensions	11.43 x 3.81 x 17.15 cm; 58 g
Item model number	GHP
Color Name	black
Connector Type	/
Material Type	Hydrophilic Sponge
Size	0
Power Source	Corded Electric

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