Old school: mash in kettle, then into round cooler lauter tun with a zero dead space false bottom with 1/16" holes. No additional filters. Grain husks have always been adequate, but it seems the particle assortment and near lack of fines make it easy to run perfectly clear, quickly and start to finish. I used to have a lengthier vorlauf and intermittent bursts of fines pulling through, particularly as density shifted when the runoff was transitioning from first wort to spargings. Not sure exactly how this applies to RIMS/HERMS users, but it does indicate improved flow through the bed. I’ve been trying my best to interpret one data point, and I think I may have bumped efficiency up a minuscule bit. Even if not, wort quality has still improved. (I used to think I’d lament the passing of the old JSP. Nope.)