One thing I haven't seen, nor want to see are spidermites. PM is bad though, you must be humid like here, we have year round humidity, rotting/mouldy leaves and melting snow, perfect breeding ground for PM in the spring.
Some of my really bad pm break outs were in rooms with low rh. Getting infected cuts you dont know about and wild inconsistent swings in room environment (temps and humidity night and day) and over fert (nitrogen) is how it happens.
I have a hard time getting my RH above 20%. I have a swamp cooler I might use at some point, but I don't like that idea at all, I'd rather have low RH than high. I'm confused though,
@since1991 do you have any idea why you had worse PM problems in lower RH?
and by big inconsistent temp swings, do you mean big changes in room temp from night and day in general, or just changes where the amount of variation itself actually varies?
I've had a lot of success with night temps around 60 and day temps around 77. Harder to control in a garage, workin' on it though.
@GroErr I'm looking on amazon and grow websites and stuff for some kind of UVC treatment for my intake duct. I don't get how most of these units would actually be installed, will they all fit in any size duct? how do you install it and where physically in the duct?
Here's what I'm looking at, pretty much ready to hit the order button if I know it'll be usable, but it doesn't say anything about diameter or anything like that.
http://www.amazon.com/Bio-Shield-UV-C-Air-Sanitizer-System/dp/B00DIYZE8S/ref=sr_1_4?ie=UTF8&qid=1458185874&sr=8-4&keywords=uv+c+light