I'm about to bottle my second batch, and it's a pumpkin spice porter. On my first batch, I was under the impression that I was supposed to use all the priming sugar that came in my kit, which apparently wasn't the case because pretty much every one that I've opened has exploded. So my friend showed me a home brew calculator app that he had, but I can't get it for iPhone, so I'm just wondering how everyone determines the amount of priming sugar to use