I don't have the address handy but there's a thread here about pasteurization. Its simple, I don't want to explain it from memory and get it wrong though.
Cider is unpasteurized typically and juice it. Its not a chemical process but heat so there shouldn't be anything present that will harm your yeast.
Cider is unpasteurized typically and juice it. Its not a chemical process but heat so there shouldn't be anything present that will harm your yeast.