Bread-Bakers v100.n074.3

I have an elementary question regarding the term "refresher" in a
sourdough recipe. I understand how to refresh the remainder of my PET but
I need to know what it means in a recipe that says, "1 cup sourdough
starter, refreshed". Also is it possible to use my PET which I bought
from KA in place of any sponge in a sourdough recipe? Thanks