I have a 3 vessel setup (hot liquor tank + mash tun + wort kettle) in a single tier setup so I need to pump liquid from one vessel to another, but I only have one pump, so I batch sparge: transfer wort from the mash tun to the wort kettle, then top up the mash tun with sparging water from the hot liquor tank -- rinse and repeat.
What is better, both in terms of wort quality and mash efficiency:
- keeping the grain bed covered in water and topping up with more sparging water before it starts runninng dry,
- letting the grain bed drain completely before adding more sparging water?
I've tried to avoid running the grain bed dry, but I'm often struggling to hit my target gravity, and at the end of the day there's still a ton of sugars left in the spend trains.
Your opinion on both options with pros and cons would be appreciated!