The Sourdough Lab

It is almost certainly not dead. Sourdough starter is incredibly resilient. 99% of the time, a "sluggish" starter is just cold. If your kitchen is below 75°F, the microbes are taking a nap. Move it to a warmer spot, feed it when it's just past peak and it will start dancing.

I'm not picky, but the microbes are. Use filtered or spring water (chlorine in tap water is a starter-killer. If you must use tap water, allow it to sit on the counter for 24 hours for the chlorine to disapate. Water purified by Reverse Osmosis or Distilled Water lack the minerals your microbes love.) and unbleached all-purpose or bread flour. If you want to spoil your microbes, a little rye or whole wheat flour acts like rocket fuel for fermentation.

Plan for 3–5 days for the time you receive your dehydrated starter. That’s how long it typically takes to wake up the dehydrated culture and get it back to its "Ferrari" level of activity. Once it consistently doubles in volume within 4–6 hours of feeding, you’re ready for the oven. Pro-tip: Start in the morning on day one.

It’s not "wasting"—it’s population control. Think of your starter like a garden. If you let every plant grow unchecked, they’ll suffocate each other, run out of nutrients, and the whole thing will die.

• It maintains the correct ratio of microbes to "fuel" (flour).
• If you don't discard, the colony becomes too dense, consumes its food too quickly, and becomes overly acidic/sluggish.

Absolutely. If you can follow a recipe and stir a jar, you’re qualified. By using a pre-established, robust starter, you’re skipping the "is it alive or is it mold?" phase that discourages most beginners. We’ve done the microbiology; you get to do the baking.