http://www.e-Purifiers.com/PurifiersInfo/HomeAirPurifiers/index.php http://www.e-Purifiers.com/rss/HomeAirPurifiersTips.xml Home Air Purifiers from e Purifiers Bacteria, microbes, and other form residues can grow up and multiply in filters if not changed regularly or if neglected. Based upon the study changing a filter should occur every 2 months up to 6 months. For the crucial performance of any filtration systems, its inner part or the membrane should b Sat, 04 Nov 2006 18:32:59 -0700 http://www.e-Purifiers.com/PurifiersTips/15.php http://www.e-Purifiers.com/PurifiersTips/15.php Everything here is © e Purifiers, Copyright 2006, All Rights Reserved Worldwide.