Now THAT was an update...
Looking great, AB!
How are you liking the PRIMO water?
Yeah, I've been planning on picking up a rain barrel for a while now but the things are pretty damn expensive.
I think you answered your own question...
Rainwater is great for outdoor grows and permiculture gardening, but for indoor grows you are bringing in a host of pathogens if it isn't treated some how.
Not to mention it really should be diverted for the first 10-minutes or so so as not to collect all the crap accumulated on the roof.
If it is stored in the barrels uncirculated, silver or some other anti bacterial agent needs to be used.