It gets really close to the top. Use foam control and watch like a hawk. I used to keep a spray bottle of water handy to help prevent boilovers. After about 10-15 minutes, you've usually boiled off enough to relax a bit.
+1 turkey fryer and spray bottle
Definitely turkey fryer, since I started using baby gas drops I no longer need to keep my spray bottle close by.
I use the turkey fryer set up to BIAB and have been able to do a 5 gallon batch with 10 - 11 pounds of grain max. And that is only possible by having around 2 gallons of water in a separate pot for dunk-sparging, then adding after 30 minutes of boil time to make room in the pot. PIA, but it works!
I wish I could find some without flavoring. I should just order some fermcap.
That said, I did 6.5 gallons in a 7.5 TF pot last weekend. I had no danger of boilover with a fan blowing over the surface. Great tip I picked up.
Boil a full pot of water for 30 minutes or so. This will oxidize the aluminum and create a good barrier. People use aluminum pots for all aspects of brewing. No worries. If you want more specifics on brewing with aluminum, there are plenty of threads that will come up in the search tool.
xjmox14x said:Yep, so long as you're not doing ridiculously high gravity BIAB sessions, 7.5 will be fine for a 6-6.5 gal boil. Just keep an eye on it for boil overs. Internet sale or local?
MichaelsBrewing said:Yeah where is the sale??
Jacktar said:Canadian Tire.