I used rain water for a while too. Maybe it sat outside too long but it brought in tons of gnats. The tap water here is not the best (a bit hard) yet it still works fine. I personally would not use it (rain water) again so I'd have to advise against it too.
Ocotillo Reviewed by Ocotillo on . Rainwater!! ??? Ive heard rainwater is very good or even the best thing to water your plants with' and as i live in the uk where it's not always raining' but does rain quite often'.. like right now for instance which prompted me to post this'.. is it good' bad' clean even' ?????? Rating: 5