Does your Sodastream keep overflowing? You might be carbonating your drink too much.  Here are 6 steps to solve it.

To have your Sodastream keep overflowing, can be very inconvenient. Regular bottled sodas already overfill, making a mess all over the place, so that’s the last thing you want your appliance to do.

After all, you spent your hard-earned money on it, right?

Yes, Sodastreams fix a lot of problems and make for a convenient way to carbonate your drinks at home, but when this issue keeps occurring whenever you want to use your unit, you can start feeling like it’s time to throw it away.


There are many possible reasons why your Sodastream might keep overflowing. From exceeding your carbonating bottle’s maximum capacity to over carbonating your drinks. Anything’s possible.

In order to properly troubleshoot your unit, you need a clear idea of what you’re looking for. And while I know the research required for this can be very tedious, it must be done.

Worry not, though! I have already taken care of it for you.

Below you will find a list of the most common causes behind this occurrence and the easiest steps you can take to address each one of them. If you follow them to a tee, I’m confident that your appliance will be as good as new in no time.

Are you ready? Let’s go!

Fixing an Overflowing Sodastream

Since Sodastreams are not awfully complicated on the inside, the solution to your problem will most likely be found in the way you operate the appliance. I want us to analyze the way in which you refill your CO2 canister, serve your drinks, and fill your carbonation bottle.

Your Sodastream might keep overflowing due to:

  • An overfilled carbonating bottle
  • Not fitting the bottle properly
  • Excessive shaking when serving
  • Using water that’s too cold
  • Overcarbonating
  • Carbonating other liquids

#1 You’re Overfilling Your Carbonating Bottle

Just as it happens with any other appliance, your machine’s bottles have a recommended maximum capacity. If your Sodastream keeps overflowing, chances are you’re exceeding this limit.

While the official capacity for these bottles is about a liter, you should always try to put a little less water inside them, as the carbonation process can increase the liquid’s volume temporarily.

Remember that, in order to carbonate your water, your Sodastream will trigger a chemical reaction in it.

Solution: Give your user manual another read-through. Most likely, you’ll be able to find the maximum recommended capacity in it.

Alternatively, you can also look for a “Max” marking inside the bottle.

When used properly, these accessories are designed to last for up to three years, so make sure to take good care of them.

#2 You’re Not Fitting the Bottle Properly

carbonating machine with bottles fitted
Make sure that the bottle is sitting tightly before carbonating

This might sound like something completely obvious, but you’d be surprised at how many people pay copious amounts of money every year to repair their appliance, only to find that they were not fitting the bottle properly when operating it.

These appliances are designed to make our lives more convenient and provide us with delicious drinks, so it can be very easy to stop paying attention to how we use them.

Solution: Try and be a little more conscious regarding how you operate your Sodastream. Carelessly fitting the bottle will not only result in a big mess in your kitchen but also waste precious CO2 from your canister over time.

#3 You’re Shaking the Bottle Too Much

pouring carbonated drink in glass
Be gentle when serving your carbonated drinks

It’s very hard for this factor to create problems on its own, but when coupled with overfilling, the chances of it manifesting itself, are much higher.

If you’ve ever accidentally dropped a bottle of soda, you know how fizzy it gets, and how long you have to wait before you can try and open it again. Patience definitely pays off in that scenario.

This happens due to a chemical reaction in the CO2 within your soda’s water, which is triggered by a sudden, and somewhat aggressive movement.

Granted, shakily removing the bottle from your Sodastream is not as aggressive as dropping it, but the fallout can be very similar.

Solution: Avoid overfilling your Sodastream bottles, and try to remove them from the appliance as carefully as possible. Combining these two good practices will get rid of your overflowing problem.

#4 Your Water Is Too Cold

Believe it or not, the carbonation process can be affected by your water’s temperature.

If you want to get technical, the reason behind this is a chemical reaction. As you know, the CO2 that carbonates your drink is a gas, and when your water is cold, it absorbs it much better than when it’s lukewarm, or hot.

Have you ever left a bottled soda in the freezer for it to cool down quickly, only to have it spill all over your shirt and floor when trying to open it?

Well, this is a reason why.

Provided that you always stick to your manufacturer’s maximum recommended capacity, and don’t remove your Sodastream’s bottles too aggressively, chances are you’re using extremely cold water.

Solution: No, you’re not stuck with having to drink room temperature beverages forever. That would defeat the purpose of owning a Sodastream altogether!

If you just can’t live without ice-cold drinks, you can try and fill your bottle a little less to make up for the excessive carbonation reaction.

You’ll probably have to go through a trial and error process, but in the end, it will be worth it, and you’ll be able to enjoy your drinks the way you like them.

#5 Overcarbonating Your Drink

Can you carbonate your drink too much?

Of course!

We all enjoy a fizzy, refreshing drink, but how fizzy is too fizzy? While your Sodastream does not have a built-in mechanism to prevent you from over carbonating your drink, you should try to avoid doing so.

If your appliance keeps overflowing, chances are you’re holding the carbonation button down for too long. This can not only make a mess in your kitchen countertop but also cause you heartburn and indigestion.

Solution: It varies from model to model, but in most cases, you should be able to find clear instructions in your user manual as to how long you should carbonate your water. Provided you find nothing in there, you can easily find this information by doing some research online.

#6 Carbonating Other Liquids

assorted bottled liquids
Only carbonate water and add the flavor after carbonation

If you’re new to using a Sodastream, this is a golden rule.

As opposed to popular belief, you should never carbonate your drinks after you’ve prepared them. If you wanted a fizzy orange juice, for example, the most logical thing would be to pour it into the bottle, and then carbonate it, right?

Surprisingly, this is a mistake!

It may sound counterintuitive, but in order to properly carbonate your drinks, you must first add CO2 to plain water inside your Sodastream bottle, and THEN add any kind of syrup or extra ingredient. And there’s a very good reason for this.

Your Sodastream, and any other carbonating machine, for that matter, is specifically designed to add a certain amount of CO2 into plain water with every pumpIf you try to carbonate any other liquid with your appliance, you’ll end up with messy, and likely disappointing results.

Worry not, though, there’s an endless selection of flavored syrups you can buy online to prepare your favorite drinks by adding them to your carbonated water.

Solution: More often than not, you will find clear indications of the entire process in your user manual, so it would be a good idea to give it another read-through.

Alternatively, if you know another proud owner of a Sodastream, you can always ask them for the method that works best for them. Word of mouth can’t be beaten.


To have your Sodastream keep overflowing can be very frustrating. While you were not unfamiliar with this occurrence with soda bottles, you probably bought this appliance to avoid it from happening ever again.

Luckily, turning this situation around is very simple. More often than not, the reasons why this is happening are more closely related to your user habits, than to a technical error.

All you have to do is read your user manual.

Remember to avoid overfilling your bottles, place them correctly, and avoid using anything other than water for the carbonation process. I’m confident that, if you do this, your overflowing problems will be a thing of the past, soon to be forgotten.

Thank you so much for sticking with me all the way to the end. If you found this article helpful, why not keep learning through other incredible resources below?

Stay refreshed!