Efficiency is proportional to the energy that is inputed in the system to produce a certain amount of useful energy. Because this product is not too big, it will not purify as much air as the ones that are 100 meters tall, but at the same time will not use as much electricity. 

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When we were designing our product, we considered the standard scale for air purifiers and their effectiveness. The two main parts we focused on was the CADR, or the clean air delivery rate, and the square foot coverage of an air purifier. While many products sit at around 250-300 rating for the CADR, covering 350 to 500 square foot of room in 2 hours, our product's CADR rating was far over 500, covering up to 700 square foot of room in 2 hours. 

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Of course, when we were researching and creating our product, we made sure the CADR rating was representative accordingly to the differing sizes of air purifiers. For example, a 100 meter air purifier's rating would be incredibly larger than an air purifier that will fit in your pocket. 

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Also, because our purifier is electricity powered, there is also an option of adding a solar panel charger to your CAFA purifier kit. You can have that addition do that by just paying $20 more dollars for your purifier! Not only will this $20 dollar save your electricity bill, but also it will increase the efficiency of the machine, not needing any manual charging.