Recirculating in the mash tun! For my home brewing mash tun I use a Blichmann 20 Gallon Boiler Maker Brew Kettle with the Blichmann false bottom.  I use a home brewing march pump that then recirculates my wort through a digital RIMS unit that I made which maintain the mash temp for me.  Since I am brewing in a stainless steel kettle and not an insulated cooler, I need to regulate the mash temperature.  During the 60 minute mash process I constantly have the wort circulating which helps clear it as well as boosts efficiency by circulating the hot wort (typically at 151F ) over the grain bed. I use the MoreBeer Ultimate Sparge Arm for my wort recirculation .  Is is the best sparge arm that I have ever used and never jams up!