This is a great thread that has helped me immensely. Figured I'd share how I used it...
So I had a real tough time figuring out exactly how much of everything to use (water, acid, and sodium hydroxide) in each step. It took me a long time to convert all of the different measurements mentioned. So...being a spreadsheet nerd, I took the steps outlined in the
Advanced Aquarist article and put everything into a spreadsheet that calculates how much to use.
This is what it looks like:
Basically you just have to simply figure out how much GFO (in cups) you want to regen, enter that into the spreadsheet, and the rest will calculate.
I tried attaching it to this post, but never attempted this so lets see if it works!
Disclaimer: I'm not a chemistry expert at all, not even a novice, so if anything is off (numbers, etc) let me know.
Disclaimer: I am an excel expert 
and am sure there's better ways to do this.