Keto Sourdough MasterClass™ — Your Starter

Maintaining Your Living Starter

Where Ancient Art Meets Low-Carb Science

Welcome to Sinless Sourdough™, where ancient art meets low-carb science. Let’s talk about why properly maintaining your flexible keto sourdough starter really matters.

I’ve learned this the hard way through plenty of trial and error. Whether you’re dealing with a dehydrated starter, feeding your living starter, or trying to reactivate something that’s been sitting in your fridge for way too long, the key is consistency and care. I know that sounds obvious, but you’d be surprised how easy it is to get sloppy with starter maintenance and then wonder why your bread isn’t turning out right.

Getting Started

Storing Your Dehydrated Starter

When you first get your dehydrated starter, just keep that package in a cool, dry place at room temperature, and try to use it within a year for the best results. Once you’ve got it going though, that’s when the real work begins, and I want to be honest with you about what you’re signing up for.

A Daily Habit

The Importance of Stirring Every 12 Hours

You’re going to need to stir your living starter every 12 hours, and I know that sounds like a lot, but there are really good reasons for this. When you stir it, you’re evenly distributing fresh nutrients and oxygen throughout the starter, which prevents that gross separation and clumping you might have seen in other people’s starters. It also breaks up gluten strands in the Fiber Flora™ starter and combines the nutrients in the almond and coconut flour starter. Stirring regularly may help prevent mould growth. All those microorganisms in your starter need equal access to food, so stirring promotes a healthy and active fermentation process.

The Schedule

Understanding the Feeding Schedule

Here’s where the feeding schedule gets a bit complex, but stick with me because getting this right makes all the difference.

Month One: Every 12 Hours

For the first month or first 4 batches, you need to feed your starter every 12 hours — I know it’s demanding, but this is when you’re building that strong microbial community. You’ll know you can cut back to feeding every 24 hours when your starter begins showing a heavy amount of gas bubbles and that liquid layer called hooch.

Month Two and Beyond: Every 24 Hours (Plus 12-Hour Stir)

By the second month or about the fifth batch, you can start feeding your starter every 24 hours, but you still need to stir at the 12-hour mark. So if you feed and stir at nine am, you’d stir again at nine pm. You will instinctively know that it’s time to cut back on the feedings when your starter is growing at double the speed.

Short-Term Storage

Refrigerating Your Starter

When and How to Refrigerate

Now, what if your starter is ready for use but you’re not ready to bake? You can refrigerate it, but timing matters. You want to refrigerate your starter when it’s at peak activity, usually 4–8 hours after feeding. Use a clean glass jar with the lid on fairly firmly — not completely airtight, but snug enough to protect it from picking up other bacteria and odors from your fridge.

How Long Can It Last?

In the refrigerator, your starter becomes almost dormant, which significantly slows down its fermentation process. A refrigerated starter can typically last 1–2 weeks without feeding, and while some people push it to a month, I generally recommend feeding it at least once a week for optimal health.

Many bakers find that their starter remains viable for about two to three weeks without feeding, but extending beyond this period means you’ll need more effort to revive it. After a month in the fridge, your starter may become sluggish and will likely need several feedings at room temperature to reactivate effectively. If you’re planning to store your starter for longer than three weeks, honestly, consider dehydrating it as a more reliable long-term storage method.

Waking It Back Up

Reactivating Your Refrigerated Starter

If you do need to reactivate your starter after it’s been in the refrigerator for up to a month, here’s what you do. Remove it from the refrigerator and pour off all that liquid hooch. While you never discard starter when you’re baking regularly, discarding is necessary after refrigeration. Discard about 1 cup of the starter, leaving just a quarter left in the jar. Mix thoroughly to incorporate air. Feed the starter again the appropriate flexible keto flour combination, and then cover the jar loosely and let it sit at room temperature for about 12 hours.

Feeding Instructions After Refrigeration

For feeding after refrigeration, you’ll feed it 1 tablespoon each of your flexible keto flour combination and about 4 to 6 tablespoons of spring water. Mix well, loosely put the lid on, and store it in the warmest part of your kitchen. Continue feedings every 12 hours until you have a full jar of starter ready to use.

Long-Term Storage

Freezing Your Starter

Going Away for 4–6 Months?

What if you are going away for a while, such as 4 to 6 months? Well, here’s the good news. Your flexible keto living sourdough starter can actually be revived from the freezer. Freezing is actually a great method for long-term storage because it helps preserve the yeast and bacteria for months.

Reviving a Frozen Starter

If you need to restart a frozen dehydrated starter, first let it thaw at room temperature overnight. Then discard enough so that you’re left with 1/4 of starter in a 16 ounce jar. Feed the starter it’s 1 tablespoon each of your flexible keto flour combination and spring water. Let it wake up for 12 hours. Feed it again. You’ll need a few feedings for the starter to reach the top of the jar again, which then indicates you can start baking.

Know Your Starter

Recognizing Starter Health

A Key Ingredient

The Importance of Using Spring Water

I always recommend using spring water at 7 pH for feeding, and here’s why it actually makes a difference. Spring water typically contains beneficial minerals that may enhance fermentation, usually has a more balanced pH compared to tap water, doesn’t contain chlorine or fluoride that many municipal water supplies have (which inhibit yeast activity), comes from a natural source that aligns with artisanal baking approaches, and the mineral composition can contribute to a more complex taste profile in your final bread.

If the spring water has a pH of 8, it may not activate as it’s too alkaline. Be sure to watch the video on the Importance of Water.

Every Kitchen Is Different

Understanding Environmental Factors

You need to understand that your starter’s behaviour will vary based on your environment. The texture may change depending on flour combinations and brands you use, and growth rate absolutely depends on weather, temperature, humidity, your feeding schedule, and the amount of spring water you use. Your starter may be highly active in the winter due to the heat in your house and not as active in the summer if your house is air conditioned.

Try to find a spot in the kitchen that’s warm. You can always purchase a heat mat — you’ll find one in the Sinless shop. Don’t panic if your starter doesn’t behave exactly like someone else’s — these are living cultures, and they respond to their specific conditions.

Baking Day

When You’re Ready to Bake

When you’re ready to bake, measure out 1 cup of starter from the 16 ounce jar for your recipe, and transfer the remaining starter to a sterilized, dry 16-ounce jar, and begin the feeding process again.

Do you really have to keep changing jars every time you feed your starter? Not really. But it is the most extreme and safest method to avoid bacterial growth. Make sure your starter is at peak activity and at the top of the jar before using it for baking.