What is so great about Prime that no other brand can do? From reading about it on here it sounds like it's the only acceptable brand (or Seachem are all paying you to advertise and rave about it) and yet I don't see a single thread about sick/dead fish where someone says "Ah, your problem is that you used the wrong water conditioner!" How do you know Prime is better than, say, Aquasafe? Will all the tropical fish in the UK develop white spot and swim bladder problems now it's hard to acquire?
Not that I'm sceptical about it being an effective product, but I have yet to see any evidence presented here of what makes it superior. Just people saying "it's the best".