I have the Philips DreamWear Full Face Mask and the “recommended” resupply schedule is to replace it once a month. That seems wacky to me, although now my mask is making a really annoying high pitched whistle and I can’t get it to stop.

I searched a bunch of old threads and 1) it’s definitely coming from the mask and not the machine 2) there’s no condensation in the mask/completely dry and 3) I try covering up every part of the mask with my hand and it still whistles

Is there an easy way to fix this? I honestly would hate to replace it every month, not for cost but for the environment

submitted by /u/asianfootboys
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