My only issue is the weak sponge that comes with it had to be refilled every 2 days or so, it didn't hold the moisture

I liked the sponge because it was re-usable, and much less expensive than the gel systems.

I bought a cheap little sponge at the grocery store and cut a piece and put it in, now it works great

Easy, works well and the replaceable sponges now eliminate mold concerns

I have tried the gel packs, too, but I like the sponge better than the gel packs

Having the removable sponge is a big improvement from the older versions that used a syringe.

they are good sponges that work well

And every month or so, wet the sponge and zap it in a microwave for 2 minutes to kill any bacteria

This inexpensive "sponge in a shell" does the trick.

I don't LOVE putting wet sponges in my guitars, but I LIKE that my guitars stay moist and sound nice.

This inexpensive "sponge in a shell" does the trick.

These new versions have a different sponge, much lighter, less dense, and don't hold as much water; these tend to drip a LOT more than the older versions with heavier, denser sponges

My older model does not open and the sponge is getting a bit dirty.

I was having problems finding sponges for my acoustic humidifier, found them on line and only used one so far and am very pleased with my purchase and the timely delivery, especially during the holiday.

A workable humidifier but the included sponge is pretty worthless

Easy, works well and the replaceable sponges now eliminate mold concerns

This has a replaceable sponge, you take it out, soak it and squeeze out excess then put it back in container, would say it gets more humidity out.

But as 3 little sponges seem a bit pricey.

You can moisten the sponge quickly and easily without any syringe to annoy you or to lose.

I like how the new PW humidifier opens and has a replaceable sponge

I use the D'Addario in my guitar cases in addition to my own design...they are easy to maintain, every few days you wet the internal sponge...inexpensive and do the job

I bought a cheap little sponge at the grocery store and cut a piece and put it in, now it works great

I liked the sponge because it was re-usable, and much less expensive than the gel systems.

Dries out in a day or so, small sponge, too much hassle, wouldn't recommend at all

Additionally, the sponges on these typically don't hold up all that well over the years and are generally inconsistent in size (I have 4 of these products)

The dry sponge can be a little difficult to remove with fingers but tweezers or needle nose pliers work perfectly.

Like it a lot because it doesn't touch the wood of the guitar... the sponge inside is small so it need frequent watering... but that is a small price to pay.

Just wet the sponge, drain it and slide it into the case, and put it in your guitar inside of a guitar case after each time you play.

My only request would be to make a denser sponge that holds more water

This same style is available from other manufacturers, but without the removable top and replaceable sponge

I have one from years ago where the sponge was no longer good

The sponge is still good and has shown minimal discoloration

Two great tips in one:Use a regular, more dense sponge, thicker like the ones at the dollar store

Dump those P.W. sponges and purchase smaller sponges sold in a packet at the Dollar Store

The sponge is not the best at holding water

I have the pro version for my ukulele and would definitely recommend spending a little more for the denser foam sponge.

Love it, thank s!