Equipment - 3 20 liter pots, plus some smaller pots.

2 Laundry bags - one cotton and one polyester?

1. I will have the grains double crushed, and keep the steeping grains out of the mash.

2. For 5 Kilos of grain I will use 12 liters of 73C water.

3. I will place the grain in the bag, place the bag in a pot, then pour in the 73C water, mixing it in. The wort will end up at around 67C

4. I was planning on mashing for 30 minutes, stirring after 15, and keeping an eye on the temperature. Then taking the bag out, placing it in a colander to drip out some of the wort. I will press it down with a pot lid to help squeeze out a bit more.

5. Then I will place the bag in another pot with another 12 Liters of 70C water for an additional 10 minutes, dunking stirring it, and then gradually heating it to 75C for mashout. This 2nd pot is also the lauter.

I assume that since most conversion takes place in the first 15-20 minutes I am not getting much after 30

http://books.google.com/books?id=zV9bpyykN...ing&f=false

By using 1.1 liters of water, draining, and using another 1.1 liters of water, I have read i will get better efficiency than putting all the water in the pot (the traditional BIAB way).

6. I will boil both 20 liter pots on my stove (each containing roughly 10 liters of wort) plus what I get from the steeping grains which will be steeped separately.

After the lauter, I will place the bag in a colander and continue collecting runnings that I will add to the brew kettles.

Any thoughts of this? Anything I'm doing wrong?

I could split the grain bill into 2 smaller batches, one for each bag/pot and then add more water to each and not perform a rinse. But I think I will get better efficiency this way. With the mashing in 2.5L/Kilo of water, and the 2nd mash/sparge I am hoping to get better results than placing the grain in more initial water, with no rinse.

I will still end up mashing for 40 minutes so I wont miss out on more than a couple of percent.

Or am I making some serious mistakes?