The efficiency of any filter becomes better with every trapped particle. Each particle a filter captures acts to absorb other particles, therefore the longer the service life of a filter the greater the performance. The Green Screens performance numbers increase dramatically through its service life because of its large dust holding capacity, which allows your system to cool or heat your home with cleaner air longer.
Environmental research has uncovered a surprising and disturbing factor in our health -- the quality of air in our home. It is much more important than we thought.
According to the Congressional Quarterly, indoor air is often two to five times more polluted than outdoor air -- and can be up to 100 times as dirty. Although this is a serious health concern, we are fortunate that our homes and offices can have clean air for healthy living right now.
See http://www.howetobreathe.com for more information.