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by DaleChen on January 30, 2012
I am not noticing any increase in noise. The filter does decrease the airflow slightly and it is expensive at 7.95/pc but it does seem to work; I am surprise the amount to dirt it trap even while I am using the foam + the ultrafine white filter.
by Dennis on November 18, 2012
I'm amazed at how much dirt this filter traps. I use it between the water tank and hose on my Respironics. It doesn't increase noise, and I don't notice any difference in air pressure. I highly recommend this filter.
by kcmouse on January 6, 2014
For many years I have been on antibiotics for an upper respiratory infection at least every 30-45 days. After installing this filter, I actually went 60+ days without being on antibiotics for upper respiratory issues. I believe this filter had a great deal to do with that and am thrilled.
by pbrane1 on September 20, 2013
these are great. sucks in the dirty air and traps it. wonderful product
by Anonymous on July 18, 2013
No increase of noise, very little reduction in air pressure. The amount of dirt it traps was astounding!! If it sounds like a siren chances are you have a poor fit of your mask.
by Anonymous on February 22, 2013
I was surprised to find the amount of dust in the filter even after the filter in the Respironics. I gave one to a follow Cpap user. He was surprised to see it and will try to get his own.
by Anonymous on February 17, 2011
Absolutely worthless. It sounds like an siren when you inhale, making it impossible to sleep!