i have one of these alex
http://www.ascott.biz/acatalog/Novital-Food-Dryer-DP89.htmlthen you know exactly whats going into it, it is just hot air dryed
we often go berry picking , wash them then dry them in this so they last all year , differant seasons have differant berries, i know its alot of money but worth its weight in gold, my birds have the best dryed fruit you can get haha