
Here is an example from a recent brew. You can see I planned to mash in with 17L and then add 11L to mash out.
It took me a while with BS3 to work out that mash salt additions are applied to the combined volume (28L).
I added a 2ml addition of 85% phosphoric acid which BS3 says will make the adjusted Ph 5.45. I didn't make it enough to drop to what I really wanted (5.2) as I always overshoot.
I was thinking through this and I was wondering if BS3 assumes my acid will be added to the combined volume (28L) or what I've been doing and adding it to the mash tun which is only 17L. If Its built on the premise that this is added to the 28L then that would explain why I'm overshooting my reduction by so much.
Thanks for the link to the prior thread. This is useful too.