Hey Pol, I just wanted to thank you for this awesome thread. After hours and hours of research it looks like your system is exactly what I am looking for; so I guess that I'm the 9th person on this forum that wants to build it! I will probably go with propane for the BK for now and maybe upgrade later to the E-Keggle. Anyway, most of my questions have been answered with this thread, however, I have a couple for you.
1. I plan on fly sparging. How to you measure that the arm is 1-2" off the grain bed since you can't see inside the MLT with the top on. Is it just experience, or do you have some way of measuring the distance? Also, do you place the nozzle slightly above or below the 1-2" water line?
2. When sparging, how do you ensure that you are maintaining the 1-2" water level since you can't see inside the MLT? Again, experience, or something else?
3. If possible, could I get a copy of the excel spread sheet that you have come up with. I would appreciate it.
4. In your YouTube video I see that there are a couple of notches cut into the top of the MLT. Is this from an earlier build, or do they serve a purpose with this set-up?
5. When you are in the mash phase, where do you place the flexible arm in the MLT. Is right above the grain bed, in the middle MLT, or on top? Also, do you position it so you get a whirlpool effect, or do you try and minimize that?
I am sure I will have more questions as I get further into it. Again thanks for all of your help.