what do you mean by re extract?

the original extraction was a/b not stb. it wasn't extremely thick. anyhow, in the past three pulls to fill a gallon worked fine for a/b. this however had crappy yields.. the reason he wanted to use the old solution was for the basified content, the pH is just right and SWIM isn't a fan of buying lye.

but thats good to know, so swim should divide the solution before adding base to avoid thickness?