I plan on doing a frozen bank once I get my tubes I will pick up some food grade glycerin and hopefully my centrifuge off ebay. Then spin out most of the water add some glycerin and slowly freeze it. I figure if I have 5 different types of yeast and 5 vials of each strain. I can brew what I want and not have to buy yeast for years. Use one vial 5 to 10 time each time washing the yeast cake. then move to the next vial of that yeast rinse and repeat. Once I use up that vial I will then have 2 vials of generation 2 then use up both those go to then next vial rinse and repeat. I know there is math there but I a to lazy to figure it at the moment
It is a lot of batches though.