I only used 1 stick and it unraveled during use! At first glance it looked like cotton but I don't know why it doesn't hold up. If it comes off my humidifier is not working properly and it will start making a siren/howling noise. My manual says my wick or filter is not seated properly or not saturated enough. Soaking only takes 20 minutes at best, but I've tried 20 minutes and then left it overnight! Same problem - they dissipate when placed in a humidifier. I put it down to them being made of bad material(?). I wish I could go back but I just need to find another supplier for them.
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