Its made from a 1.8l Lock&Lock water tight food container. The hot wort enters through the tank connector at the top and exits through the copper filter at the bottom. My original plan was to pump the wort out of the boiler, into the hopback and then through the CFC as follows:
However, when testing it, I found that the pressure built up inside the container so much that it broke the seal to the lid and liquid started leaking. The better way was to put the pump after the hopback, so that it pumped the infused wort out and through the CFC, relying on gravity to fill the hopback from the boiler.
I used it yesterday for the first time with my APA and in general it went ok, though it took a lot longer than I was hoping for, since the flow from the boiler slowed down a lot towards the end. When I taste the beer in a couple of weeks, I'll know whether to scrap it as a bad idea or improve the design. The next step will be to find a container that can handle the pressure of having the pump placed before the hopback, but not be too expensive...
but if it's as old ours (still in use) you will need to seal the hole in the top where the weight fits which lets out the pressure when used for cooking.
