So checking back in to add some thoughts about my experience adding a
@wilserbrewer fabric filter to my three vessel process. Loving it but after three batches I still don't have my Beersmith settings adjusted properly.
I now understand and fully believe the efficiency claims from the experienced BIAB crowd. At end of lauter I've been hoisting my bag out of the mash tun and letting it fully drain. First time I did that got nearly 2 gallons of wort that I had to dump...no room in boil kettle. Second time the same. Wow figured out I needed to adjust my grain absorption rate in Beersmith. Did it again and still had too much...didn't realize I needed to change grain absorption setting on both desktop and tablet and when I ported my recipe to my tablet it changed the water quantities back to original overshoot...Still had about 85% mash efficiency, think were I will be when I get all those sugars into the boil kettle...
The hoist purchased with the bag is great. Am sure you can find something similar on Amazon but I'm really happy with this one. Got the heavier hoist and I am lifting bags that started with 30-35 pounds of grain no problem.
Cleanup is greatly improved vs cleaning mash tun without a bag. The mash tun is ready to clean sooner as I don't have to worry about cooling down that grain and even with my Blichmann autosparge almost no grain escapes the bag. A light scrub and rinse and the mash tun is done. There is no grain getting under my false bottom at all.
Disposal of the grain is greatly simplified. I used to dump the mash tun onto my driveway and let it rest/dry/cool there. Then shovel into grocery bags and throw away. Now I let the bag hang in the garage over a bucket and at end of brew day lower the bag into a hefty bag, open it up and dump it out. Bag gets rinsed off and hung to dry and the trash bag full of dry grain is tossed ... without breaking the hefty bag at least three out of three times I've tried it.
I am still doing 3 vessel but believe the addition of the bag is helping me get clearer wort into my brew kettle (I have no position in the debate about if that matters) and is reducing chance of stuck sparge. Even with decent adjunct load in the vessel I am able to run my recirculation pumps much faster (about 1.5-2 GPM) without any signs of compacting.
So after all this why don't I BIAB? I still like the three vessel process and have it built. But I am a big fan of the bag itself and highly recommend adding a bag to other three vessel brewers. And given my experience I can certainly understand why so many new brewers are starting and deciding to stay with BIAB.
Cheers!