Product review (5 stars): Helped my son get rid of his cold
I desperately needed one of these to replace the one in my son's filter.  It works great and I can tell you that when I replaced it, my son started breathing better at night.  He had been suffering from a nasty cold that was causing him to cough and be congested in his chest and nose, but within 24 hours of replacing his filter I noticed he began to clear up immediately.  I really think the filter helped him to begin the process of feeling better.