Hello. I've been preparing and cold-smoking fillets of trout for myself for a few months now. Lately, a few of my friends and lots of my family have asked me to them some. I thought that I'd do some research before agreeing and I've come across lots of info including the FSA guidlines. I'm completley puzzled as to how I can measure the salt content to ensure I'm achieving a 3.5% salt content in my fillets. I don't use a wet brine, I always use dry ingredients of salt and sugar. From what I understand, this level of salt, along with correct temperatures during a workflow, prohibits the growth of Clostridium Botulinium. I'd be very keen to understand how this can be measured.