Thanks everyone for your input. I'm not convinced that using rainwater is a problem. It never has been for me or my father. I used it for 5 years between 15 and 10 years ago, and I re-started brewing using it nearly 2 years ago. These periods were in different locations, and I've made hundreds of brews from cans. My overall success rate is well over 95% with most, if not all failures attributed to temperature control / autolysis. I've not had to pour out many brews at all. My success rate here over the last 2 years is around 98% with all other than these 2 batches being easily attributed to a known problem or cock up on my part. I simply don't see those figures as being "just lucky". There can't be too much wrong with my water or I would be getting crappy beer more often than this.
I'm still going to wait for the 2 batches just bottled to condition, so I can taste them and determine if I think it was something I did. I just don't believe it was the water.
I'm still going to wait for the 2 batches just bottled to condition, so I can taste them and determine if I think it was something I did. I just don't believe it was the water.