HME Heat Moisture Exchange Filter for CPAP 10 Pack

I've been surprised at how good these are. CPAP users get warnings from youtube reviewers that HME filters aren't nearly as good as a water chamber, but this isn't what I have found at all, I can't really tell the difference. To be fair, I live in the UK which is rather a humid place to start with, and I haven't used them in dry weather (sadly we haven't had any dry weather for a while), but I have developed a lot of confidence in them.