Review on 🔳 Nispira Activated Carbon Pre Filter for Holmes AER1 Air Purifier HAPF30AT HEPA Air Filter - 9.5” x 4” x 0.25” (Pack of 4 Carbon Filters) by Greg Moore

**updated on 9/2019**These little filters appear to be true to the ad and are coated or made from powdered activated carbon and are very thin. The fineness is probably good, so when combined with a traditional filter media, it won't block too much air for the air purifier's motor to suck it in. The price is right and they are perfect for my device so I have no complaints. Will I buy again? I am not sure. I can just find scotchbrite pads at the dollar store and coat them with my own activated charcoal or lysol solution. at most outlets) and a small can of Wish Charcoal Powder. They work about the same. I don't notice any change in air quality and am very picky; almost gross, so I wonder how I can hold a man. Anyway, yeah I wouldn't buy them again unless they were like 10 packs for less than $5.