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I've had a few requests for 6" and 8" filter disks.
I think the 6" was for a carbon filter and the 8" was for a false bottom.
A little research shows that most folks make the false bottoms with round holes 3/32" on 5/32" centers. In metric that's about 2.38mm on a grid of 3.97mm. That seems to be about 30% open area and yet I hear that 50% open is more ideal.
I've seen a professional mash tun at the boiler factory with a false bottom that had slots instead of holes. Some talk about the grain bed not packing or something that I'm not sure about.
So if anyone can chime in here with advice I'd sure appreciate it.