Mixing a mixture with solution

[PhillipsC]

I have some defined solutions (1-4).  I had to mix together 2-4 first, then saved that as solution 5.  Now I want to mix solution 5 with solution 1 in 1:1, but solution 5 does not appear in the mix list.

[dlparkhurst]

Just type it, either in the MIX screen or the main edit screen (assuming you are using PhreeqcI).