STAGE 1 - Large Particle Pre-filter ?Removes particles easily seen by the naked eye (e.g. dust, hair and pet dander) STAGE 2 - Medium Particle Pre-filter ?Removes small to medium size particles (e.g. molds, spores and pollen) STAGE 3 - 6.5 lbs. of Activated Carbon/Zeolite Blend ?Removes chemicals, gases and odors (e.g. sulfuric acid and ammoni...

For optimum performance replace filter twice a season. Use to eliminate lime scale build-up on your tank and filter to insure longer trouble free performance for your humidifier.

Patented rigid support long lasting design. For optimum performance replace filter at the beginning of each season or every 2 months depending on use.