Good info everyone! I am going to change up my mash tun a bit and build a rectangular false bottom with perforated stainless. Not by choice, but my cooler has an odd middle drain with a tight angle on the inside. I've used a CPVC manifold and stainless braid, but I have too much dead space. Your suggestions got me thinking of the perforation size I'll have to get. The more I think, the deeper the rabbit hole goes.