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Some of the best air purifiers, as of 2015, include the Alen BreatheSmart, the Coway AP-1512HH and the RabbitAir MinusA2, according to Top Ten Reviews. These air purifiers all receive top marks for their filtration ability and array of features.


The effectiveness of air purifiers depends on the quality of the purifier, the pollutants present in the room, the size of the room and other factors. Overall, good air purifiers are effective only to some extent. Even the best air purifiers can't remove all the pollutants from the air.


By removing allergens and pollutants from any environment, air purifiers can reduce allergy symptoms and thereby improve overall quality of life. Although treating asthma is a complex, multifaceted task, improving indoor air quality can certainly play a part in reducing asthma symptoms.


Testing and scientific studies have found that some air purifiers are not effective at all, while others are actually harmful to users, according to HowStuffWorks. Other studies have found that air purifiers that contain filters are the most effective way to clean the air in the home.


Depending on the type of filter, an air purifier may clean dust and mites, mold, pollen, pet dander and bacteria from the air. Some filters are designed to clear away odor-inducing particles, such as smoke, charcoal and carbon.


Air purifiers are particularly helpful to people who suffer from allergies or asthma, because they reduce or eliminate contaminants in the air. They're designed to manage airborne particles such as dust, pollen and pet dander, and reduce exposure to health risks such as secondhand smoke and bacteria


About half of the portable and console air purifiers on the market carry the brand names of Holmes and Honeywell, according to Consumer Reports. In addition to these two leaders, consumers prefer air purifiers made by Blueair, Germ Guardian, Hunter, Whirlpool, GE, Oreck, and the private-label brands


Air purifiers generally require maintenance every three to six months to maintain optimum efficiency. Those with permanent filters or collection plates usually require more frequent cleaning, while disposable HEPA filters usually last between six to 12 months. Many models incorporate a timer or sens


Some air purifiers with high ratings include the RabbitAir MinusA2, Coway AP-1512HH, and Alen BreatheSmart, according to LiveScience.com. All of the air purifiers are relatively quiet, with the noisiest being the equivalent of a box fan.


Purify water by filtering it and treating it with a small amount of liquid chlorine bleach. This takes at least 60 minutes to do. You need water, liquid chlorine bleach, a clean container, filters such as cheesecloth or coffee filters, a teaspoon and an eyedropper.