I do 4 way "Splits", I brew in concentrate 10 gallons, then dilute to 20 gallons, and split between 4 carboys, Each with a different Yeast. I recently did a MILD recipe, with 4 yeasts, 1968,1998,1056,1084, If you like mild's all these are very different but very good. I also did a Saison, with 3864,3522, Flanders golden,3711. I have not got these kegged yet but can't wait. But it's a great way to build a yeast library.