RossC
Fish Addict
I'd be too worried about other pollution as I live near a busy motorway and A road. I think its best just to leave it as it is, the majority of fish have tolerated it so far, like I said it just bugged me more than anythingHave you tried a water butt to catch the rainwater, that be a bit different plus it hasn't been treated with other chemicals?
Try a little test first put a bucket or something out when it rains and do a test.