I have been using the Healthy Living, Ultra Allergen Filtrete Filters since the purchase of my home years ago. I have severe allergies so much so that my doctor said that I need to live in a "bubble". Not wanting to accept that information, I proceeded to find helpful aids to assist me with my allergies. Thanks to Filtrete Filters, I found just that! They work....simple as that! They may be a bit "pricey", but as some have found out, "you usually get what you pay for" and Filtrete Filters are worth every dollar. I must admit, I've tried saving money on other filter brands, and find myself returning to utilize only Filtrete Air Filters!