For BIAB brewers:
Why sparge at all? Forget the fact that BIAB is designed for simplicity and sparging defeats the one kettle process. I get that sparging can increase efficiency, so there’s that. But why not just mash with that water already? Now, if you have a small kettle, maybe full volume mashing isn’t possible. Fair enough. But with BIAB, I’ve found
without question that the more water in the kettle, the better the conversion efficiency. So if I were to withhold some of my mash water to use as a sparge, my kettle efficiency would drop and then only make it back to where it would have been after I sparge to hit pre-boil volume. Maybe I’m thinking about this wrong, wouldn’t surprise me.
As a BIAB brewer, I set my recipe efficiency based on gravity. I use 3 different efficiencies, kind of a sliding scale…72%, 75%, 78%. The bigger the beer, the lower the water:grist ratio, the worse the conversion, and vice-versa. The best thing I ever did to increase my BIAB efficiency was simply to grind my grains finer. Set my mill for as tight as she goes. I simply can’t be trusted with sparging anyway. I’d have water all over the place and probably burn myself.