This is a generic duplicate of hypoallergenic filters for the S9 Series CPAP Machines. The Hypoallergenic Filter is a combination of materials, with one side to block fine particles and the other to ward off large particulate matter.
Here is a link to the generic Standard Filter that comes with your S9 Series CPAP Machine.
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"A very good filter. I seem to get a bit less congested when I use this as opposed to the regular filter."
They really do work
Michael D, NY – January 11, 2012
"I've continued to buy this product as the filters always appear dirtier after a week than the standard filters do. That's not exactly scientific proof, but it would indicate that these filters are catching more dust than their counterparts."
disposable filters
Grace T, UT – January 05, 2012
"These filters do a good job keeping my air clean. Because they are disposable it also seems more sanitary than the washable reusable filter was in controlling bacteria."
Hypo Allergenic Filters
Eric G, GA – January 04, 2012
"They work very well and I am less congested."
Really helps my allergies!
Jane A, CA – December 27, 2011
"The filter is very easy to use and it has reduced my need for allergy meds at night."