Does the DIY purifier work? Test results (1, 2) give a conclusive answer, but this series of pictures gives a visceral answer. I took a picture of the HEPA about every seven days for four weeks. Glad that black gunk’s not stuck in my lungs instead.
In static form, here’s Week 0 and Week 5:
Free Guide to Breathing Safe
Want to learn more about breathing clean air? Join thousands more and stay up to date on protecting your health.