Sorry, in a rush, but two quick ones...
With the mashout, it's a preferable (but not necessary) step for a few reasons. One reason is that,
on average (see
this thread), it will give you a few extra percent in kettle efficiency. As for the turbidity BeachBum, your BIAB bag will have a lot do with that. Obviously, a coarser bag is going to give less clear trub than a finer one. I reckon if agitating your grain during mash-out (from memory, I don't think you agitate it during the mash but I might be wrong) leads to turbidity, then a finer bag could be the go. Or, the folowing may also be relevant...
There is a difference between turbidity and a wort that won't clear.
I, and a few other brewers had this problem about 6 or 7 years ago. None of us had changed our process but we were suddenly getting hazy beers. What the???
After ages and ages of discussion etc, the conclusion was that the malts we were using (can't remember which ones) came from a poor season. And, I think this was right as it hasn't occurred again to anywhere near the same degree.
....
The only way we found to fix it was by using polyclar. Think of all finings as being magnets but of different types. One fining might attract
x molecules whilst another will attract
y or
z. Whatever problem our malt was causing, polyclar ended up being the solution.
The main thing is, if you suddenly develop a problem you haven't had before but haven't changed your method, then it could be your malt.
PP
P.S. A 90 minute boil (which mally already does from memory) can also sort out some hazy beer problems.
If you have found
the above or anything else of value on BIABrewer.info, consider supporting us by
getting some BIPs!