BIA Basket - Mesh Size

[Twang]

I am trying to figure out which micron mesh to use for an eBIAB recirculating mash system.

On my 3 vessel system I use a jay bird false bottom that is 3/32 hole size which is ~2,250 micron and works great for that system. I read some people use 400 micron for their BIAB baskets. I'm afraid the flow might be too constricted at 400?

I want a good flow rate, but don't want a lot of grain particles carried over to the boil. If you are recirculating does your grain bed act like a filter as in 3 vessel? Or not, since the wort drains from all sides the grain bed.

I am leaning towards 800 micron which is about 1/32". But not sure if this will lead to cloudy wort in the boil...?

I will be using a standard crush.

 

[DurtyChemist]

With a standard crush why not used a standard bag? People who recirculate their traditional vessel mash tun probably get really clear wort because the grain bed filters itself.

 

[daksin]

You can go really really small. The gap size in voile is ~200 micron, the threads are about 125 micron in diameter. I use a voile bag and it's never gotten clogged- I'd say go as small as you possibly can.