Hi there, Cynthia! We always recommend that you discard as is it very important to keep the starter balanced and make room for new yeast cells and good bacterias to grow. You can see our recommended feeding process in our blog article, Maintaining your sourdough starter. We've found that the float test isn't always a conclusive tell of whether the starter is ready to be used, you can read more about this in our post, The float test for yeast dough and sourdough starter. You can certainly use the float test if you'd like, but we'd recommend using it in addition to the visual tips outlined here in this blog article. We hope this helps to clarify! Morgan@KAF

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