but, what really made me jump on the idea of finally doing something about it was an article i read somewhere that talked about how fast and how much a babies brain was developing. great bow, were having a baby so im selling down my compounds. light and lively, toe tapping music! but when i got to the 7s, i had met my match. when looking for the perfect air purifier for your home or office, it’s important to take into consideration the cost of filter replacements and how the frequency in which you have to change the filters. 