I tried doing the DIY HEPA filter because I was poor. It's not much better than just buying a cheap filter that's basically the two put together. It was okay bu

I tried doing the DIY HEPA filter because I was poor. It's not much better than just buying a cheap filter that's basically the two put together. It was okay but not too effective. Getting rid of moss cleared up most of the trouble. And antihistamine (Vitamin E) shots.