I'm currently batch sparging in a rectangular 70 quart Coleman Xtreme cooler, but I'm designing a HERMS system to better control my mash temps. Most people with HERMS systems use cylindrical mash tuns with false bottoms and simply place a tube or hose on top of the grain bed to recirculate. I would like to use my rectangular cooler if possible, but I'm not sure how well it will work as most people don't use them. I have a pretty well designed manifold that I'll use in the mash tun, but again, I'm not sure how well it will work when continuously sparging in this type of mash tun.
So, I would like to hear from anyone who continuously sparges with a rectangular mash tun. Do you have a false bottom or a manifold? How exactly do you add wort back to the top of the grain bed? What efficiencies are you getting?
Thanks a lot!