There are a few different ways you can discard your starter, Margaret. Here's what we outline in our Sourdough Baking Guide:
"If you compost, scoop it into your bucket or bin; it will quickly disappear into the mass of fermenting organic materials.
If you want to throw it away, it's best not to do so in its liquid state, as it can start to smell. Instead, pour it onto a piece of parchment or waxed paper and either bake it or let it air dry until it's brittle before throwing it away.
If you have absolutely no other choice, you could throw liquid sourdough starter down the drain — but do so with caution. You don't want the starter clogging your pipes. Place your discard starter in a large bowl and add cold water, stirring to thin it to the consistency of milk; then pour it down the drain, flushing the drain with additional cold water.
Will sourdough starter hurt your septic system? No, it shouldn't; it's simply organic matter and yeast. But again, make sure it's thin enough that it won't clog your pipes." We hope this helps, and happy baking! Kindly, Kye@KAF
November 28, 2018 at 12:22pm
In reply to If you have no one with whom to share this starter, what's the … by Margaret Barre (not verified)