As i have now purchased a digiboil 35l for doing BIAB. I no chill and have seen a couple of you tube clips of a where they use a 35l digiboil biab and leave it cool over night in the boiler. It is covered with glad wrap and the lid put on. This person then transfer the following day. I do have cubes for chilling. Also looking to buy a little brown pump for recirculation but not sure where to buy. The video clip are australian.