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Do you have a pressing AeroPress question?

Here is your chance to get your question answered by AeroPress inventor Alan Adler! Simply use the form below to submit your question. If your question is chosen, it will be shown right here with your first name plus initial along with Alan's answer. Please understand we do not expect to be able to show all questions submitted but we will do our best.

Here are the questions that Alan has answered!

Hi. We've been a fan of the aeropress for some time along with good friends of ours. We recently visited them and noticed that their plunger had little ridges on it to help stabilize it when pressing it down. My friend purchased his aeropress years before we did. Our aeropress and a new one he purchased (as a spare) have smooth plungers. Is it possible to purchase the plunger with ridges/grooves any where? Thanks! – From Jennifer L.

After a few years we learned that the ridges on the plunger were causing scratches on the inside of the AeroPress chamber. The scratches were not deep enough to affect performance but they were unsightly and the ridges provided no benefit so we eliminated them.

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I have had my areopress for three years. I took several months off from using it and began using it again on a daily basis a couple months ago. It worked great for few weeks, but recently it has become impossible to press down the plunger no matter how hard or gently I press. Do I need a new seal or a whole new plunger? – From Julia S.

Sticky coffee oils can build up in the chamber. If the inside of the chamber feels sticky when you drag you finger on it, then clean it and the rubber seal with vinegar. After that wipe a bit of vegetable oil on the edge of the seal that contacts the chamber.

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Help!! I've used my Aeropress for years, with one replacement of the rubber seal. Three months ago I got a new Capresso Infinity grinder which was working just fine, set around the middle of Fine or between Fine and Extra Fine. Things were good. All of a sudden, about a week ago, I can no longer push the plunger all the way down. It stops about 3/4" from the bottom. My husband couldn't even move it. I can push it all the way down only if I use a grind so coarse that the coffee tastes like water. Same coffee, same water, same batch of filters. Pushes out OK when I remove the end cap. I've put in a call to Jura because I think it has to be the grinder – but is there any possibility that it's the Aeropress? Any advice? – From Ellen M.

Sticky coffee oils can build up in the chamber. If the inside of the chamber feels sticky when you drag you finger on it, then clean it and the rubber seal with vinegar. After that wipe a bit of vegetable oil on the edge of the seal that contacts the chamber. If the problem persists, then it probably is the grinder. Remember too, that it's easiest to press gently.

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The instructions says I can brew up to 3 servings. But why is there four level marks on the chamber? – From Erik H.

We originally stated that you could make 4 servings per pressing but some people reported that four scoops of freshly roasted coffee together with hot water filled to the 4 would spill over the top so we now recommend 3 servings max. We left the numbers as they were on the chamber.

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Are filters compostable? – From Candice B.

AeroPress paper filters are both reusable and compostable.

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I would like to know filters specificities, like: composition and pore size (paper and steel) and what is the difference between use both kind of filters. Thanks! – From Bastian J.

Most of the filtering is accomplished by the bed of coffee. Only a bit of grind at the bottom of the bed is filtered only by the filter. The pore size of paper is much finer.

We do not recommend metal filters. Google coffee + cholesterol and read how paper filters block two unhealthy chemicals which pass through metal filters.

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I’d love a larger model so I could make a bigger americano every morning, instead of brewing twice for two cups. Any chance we will see any Aeropress XL? – From Andrew M.

Press two or three scoops. Then dilute to an Americano.

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Step 6 of the printed instructions included with my aeropress state 'fill to 2'. I see that the downloaded version states 'fill to 1'. Which is correct? Electric kettles are hard to find here in Italy, let alone ones with temperature control. Waiting 17 minutes is not a realistic option, nor is measurement. Any other suggestions for achieving optimum water temperature, please? – From Mike S.

[In response to your first question] Either is ok.
Put a dial thermometer shaft in your kettle. Either through the spout, or through a small hole that you drill in the top. When the kettle starts "ticking" watch the thermometer and stop heating when it nears 80C.

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I recently cracked my favorite mug while using the aeropress. I am devastated, it was a beautiful custom-made ceramic red, the handle was perfect, I loved it…what to do, I didn't think I was pressing too hard. Help!!! – From Patrice S.

We recommend pressing gently (about 12 pounds). That gives the shortest time and the smoothest flavor.

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First of all, I want to thank you for inventing such an amazing coffee brewer..! I immediately fell in love with this as soon as I taste iced latte made by aeropress. I usually drink iced latte and very picky about it haha. But aeropress made me surprised by the genuine taste of esspresso!! I always use specific milk(oatly) and 2 espresso shots, and here is my question. If I want to make strong 2 shots, how many scoops of coffee bean should I put? And until what level (1,2,3) should I pour water? I tried several ways but not sure what is the best. I hope to hear from you soon!!! – From Suran L.

I make myself a "double-latte" every morning. I press two heaping scoops of coffee with water to between numbers 2 and 3. Then I top off the mug with about 6 oz of whole milk. Sometimes I drink it cool, other times I heat it for 45 seconds in our microwave. But really there's no "best" way. Whatever you like is best for you.

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1) What is your coffee recommendation for Aeropress? Ethiopia, Burundi, Brazil? 2) Is there a difference in measurement between the Aeropress and Aeropress Go scoop? – From Ali H.

1) I find that you'll like your previously preferred coffee in the AeroPress.
2) It's an illusion. Both scoops have the same volume.

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As I push my plunger down some coffee leaks through the rubber seal and ends up in the hollow interior of the plunger. How does it get past the seal? The plunger is stored inside the main part and it has never been in a dishwasher so why does this happen? – From Frank G.

Your coffee is leaking around the rubber seal. With use the seal eventually will become loose and let some coffee leak around it. You wrote that you store the plunger inside the main part. The AeroPress instructions advise against storing the seal inside the chamber because holding the seal compressed inside the chamber eventually will reduce the size of the seal, enabling coffee to leak around it. When your seal becomes loose, you can buy a new seal on this website. The seal can easily be replaced on the end of the plunger.

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Ive been using an aeropress for 5 years now. Love the coffee flavour and convenience. My only suggestion is that you make one that makes twice the volume so i can do my wife and my coffee at the same time. Basically i reckon the go travel version with its own stackable 2 cup jug would be a hit. If you think this idea has legs please just send me 6 of the completed product that I can share around friends and family. – From Kent H.

Thank you Kent. Are you pressing concentrate, then diluting as we recommend? Press 3 scoops, then dilute for 3 servings. Coffee brewed this way is sweeter than when you press all the water through the puck.

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What’s that clear glass mug you use in the demo? I’d like to start with something like that that I can depend on as sturdy and can see through. – From Jeff B.

Do a search for “Directoire Clear Glass Mug” and you will find lots of candidates.

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I have to use all my strength plus upper body weight to depress the plunger. Sometimes brew shoots out the sides of the top of cup in the process. I follow all Aeropress instructions, use both inverted and upright press positions, and Starbucks ground coffee. I store the maker with plunger inside tube and use Aeropress filters. I have read several letters from others who were unable to resolve the issue. What do you recommend? P.S. The coffee once made is very good, though. I don't want to give up on it. Thanks. – From Christine D.

We recommend pressing gently and having patience when brewing with an AeroPress. Try it. You will be surprised. That's because pressing hard compacts the bed of coffee and blocks the flow.

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Why use scoops instead of grams, and what is the ideal grams? – From Abe E.

Measuring the weight of coffee is more precise than using scoops but I think the precision of scoops is good enough for most people. A rounded AeroPress scoop, which is our recommendation, holds about 14 grams of ground coffee.

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Hey Alan, Long time fan of the Aeropress here. It's a life saver. I always take it with me on deployments and normally end up having to make coffee for the other guys after they give it a try. Just discovered your cold brew method. What kind of roast do you recommend for the cold brewing method i.e. light, medium, dark . . . .? – From John H.

I prefer medium roast. Light roasts tend towards sour. Dark roasts tend towards bitter.

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I’m trying to get the most sweetness out of my coffee without adding sugar. What do you recommend? – From Michael C.

Begin with medium roast. Then follow our instructions for cold brewing.

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Hey, Alan! Could u please tell me about the funnel. A lot of people use it for coffee (I mean they grind beans and after use funnel). But shape of funnel is fit with bottom of AeroPress, so u can use it for brewing also. Am I right? – From Marina A.

I designed the funnel to help pouring of ground coffee from a grinder bin into the AeroPress chamber. It was a coincidence that the AeroPress fits into the funnel. Some people have used it to press into a small cup. That's dangerous. Always press into a sturdy mug.

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Hey Alan! What’s your thoughts on brewing a concentrate to be diluted (ie. to make 237ml) vs brewing an exact amount (ie. 237ml from the start). – From Ernest L.

I recommend brewing a concentrate and diluting after the pressing. This tastes sweeter and smoother than pushing all of the water through the bed of coffee.

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I’d love to see some of your prototypes for the aero press. Not really a question but it’d be interesting. – From Ben K.

Do you recommend Aeropress Go for home use as well? My current Aeropress numbers are not as visible anymore and seal leaks air sometimes when pressing I'm considering replacing it with Aeropress Go. My Aeropress is my favorite device I have ever owned. Thank you, Allan. – From Jim M.

Certainly the AeroPress Go will work fine in your home. The AeroPress Go is a somewhat smaller AeroPress that includes a cup and lid for use for pressing and drinking and also as a carrying case when on he go.

I am sorry the numbers on your chamber are not as visible anymore. You can mark the outside of your chamber with a Sharpie pen.

Your seal leaking is an indication that your seal is worn. You don’t need to buy a new AeroPress. Just buy an inexpensive replacement seal on our website, aeropress.com. Thank you for being such a fan of the AeroPress.

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As we all know you designed the Aeropress to brew in classic way so what do you think about the invert way to brew? And did you imagine in the ways that arose in its use? – From Santiago C.

Users have invented many different ways to use the AeroPress, including the inverted way. We don't recommend that because we don’t want people to get burned. But you can extend the steeping time by inserting the seal a half inch or so into the top of the chamber and thereby stopping any drip through until you start pressing. But extended time adds bitterness.

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The rubber on my Aeropress got sticky, and it's hard to use. what could I do to fix this or what could I do to prevent the sticky rubber? – From Marcelo F.

You can clean off the sticky material by removing the seal from the end of the plunger and then aggressively washing your seal with very hot, soapy water and a paper towel multiple times if needed. The stickiness tends to occur when an AeroPress has been sitting idle so a way to avoid stickiness in the future is to use your AeroPress regularly. Alternatively, you can buy an inexpensive replacement seal from our website, aeropress.com. We now make the seal of silicone, a material that will not develop stickiness.

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Are you working on any new coffee products? I would love to see a wider product range for Aeropress! – From Naty S.

Yes, we definitely are working on new coffee products but (like most companies) new product plans are confidential.

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My partner bought me a new aero press for my birthday. We have used a friends before. When we use it (first time and second) the water falls straight through (doesn't drip). Is it faulty? We have followed the instructions and video – my friends lets water pass slowly, this just falls through. Thank you for your help. – From Olwen D.

It is normal for a small amount of coffee to drip through prior to pressing. If you are experiencing an excessive amount of early drip through, you need to use a finer grind of coffee and to give the chamber a shake to level the bed of coffee. One way to confirm that the grind is the problem would be to brew using your friend’s ground coffee in your AeroPress.

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Long time AP user but I do have one concern. What about the AP chamber makes it safe to put near boiling water into plastic for daily use. Wouldn't the temperature be dangerous to drink from plastic? – From Adel H.

We only use plastics that are rated to be safe for use in contact with hot food during preparation. Specifically, the rubber seal is made of silicone, a material commonly used in cooking such as for cupcake baking pans and flexible spatulas. All the other materials used in the manufacture of the AeroPress are polypropylene which is probably the most common plastic in your kitchen. It is for example the material of choice for most drip coffee makers.

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How to lubricate Aeropress? Thanks. – From Vincent P.

I sometimes use some olive or other cooking oils to lubricate a new AeroPress seal but once an AeroPress gets into regular use, I find coffee oils provide enough lubrication.

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Is it possible to get copies of either notes or videos of lectures on aerodynamics by Doctor Adler? I recently found a roughly 30 minute lecture on YouTube and was hooked!! Particularly by his clear way of illustrating how gyroscopic precession predictably affects a cardboard disc in flight! I would love to see and hear more from this great mind!! – From Grant S.

My sons and I LOVE our Aeropress!~ I recently purchased one for myself, so we have two in our home currently. Our question is is there a larger version of this fabulous coffee press available? If not, would the company consider making a larger version for it's devoted customers, to make two to four cups at a time?? My eldest son, has to run two presses at one time for his ice coffee fix. We all agree, it would be a wonderful addition to the original press and great increase in sales opportunity… we'd purchase an additional larger version to keep in our home! – From Karen C.

Thank you for contacting us. Yes, we are considering a larger AeroPress, but you can make large quantities with your existing AeroPress by brewing 3-scoop espresso-strength concentrates according to the instructions which came with your AeroPress and are repeated here: https://aeropress.com/use-it-now/getting-started/#steps.
It only takes a few minutes to do each 3-scoop pressing. Each makes 3 servings of American coffee or latte. I store the concentrate in my fridge, then add water for American coffee or milk for a latte when I want to drink or serve it.

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Why are some days "Hard Press Days" and some "Easy Press days"? I've always thought it has to do with barometric pressure and even thought of making an Excel sheet to figure it out, but I always forget once I have my nice Aeropress coffee in hand. 😉 – From Kae E.

The more coffee and/or the finer the grind, the more important it is that you press gently.  Because pressing hard (even briefly) will compact the coffee and block the flow.  So always press gently and be patient.  It might take 60 seconds or longer.

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Is AeroPress designed to last for a lifetime? – From Titta J.

When used as directed, all but the rubber seal should last for decades. But the rubber seal might need replacing after a few years. You can order replacements for any lost or worn parts at aeropress.com.

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What is the coffee funnel used for? – From Lynnett "Lynne" D.

I designed the funnel to facilitate the pouring coffee grounds from a grinder bin directly into the AeroPress chamber.

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Why the big paddle? Is there a reason it’s flat and so large? Why not something smaller more the size or a teaspoon? – From Rob E.

For a single scoop, any stirrer is fine.  But a wide paddle is better for double and triple scoop pressings to insure that clumps of dry coffee are fully mixed.

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Is the AeroPress Go cup microwave safe? If not, can you make one? Would be a nice way to heat up the water for the coffee when on the go. – From Jordan W.

Yes, the AeroPress Go mug is microwave safe.

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Do you like football? If yes, tell me your favourite team and player. – From Piotrek K.

Yes, football used to be the only sport I watched.  I followed the 49ers and Stanford, where I taught part-time.  But I (and my friends) began to feel guilty about players sacrificing their health for our entertainment.  So I backed away somewhat.  But I confess following the 49ers last year.

Favorite players (current): Jimmy Garoppolo, George Kittle, Arik Armstead, Nick Bosa, and Christian McCaffrey (who went from Stanford to the Panthers).

Favorites (retired) Jerry Rice, Joe Montana, Steve Young.   I could name many more greats, but these are the players that I often watched.  I've briefly met Montana and also Y.A. Tittle.

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Why don’t you offer metal filters?

Coffee which has been only metal filtered contains two unhealthy chemical which increase your LDL cholesterol.

See https://www.sciencedaily.com/releases/2007/06/070614162223.htm

Paper filters remove these unhealthy chemicals.

Furthermore, blind-tasting tests that we conducted with coffee professionals and every-day coffee lovers revealed a decided preference for paper filtered coffee.

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Will you ever make an AeroPress big enough to fill a carafe with one pressing?

We don't currently offer a larger model. But you can prepare concentrate in a few minutes before the arrival of guests. Just press a couple of triples (3 scoops each) and put it aside. Then, after dinner you can dilute the concentrate for American coffee, add milk for lattes, or offer straight concentrate as a very smooth espresso.

You can also press some concentrate and take it to work in a small container. Then dilute and drink it at work.

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I have heard that with the AeroPress you can experiment with the brewing process. Can you please explain?

With AeroPress, all of the brewing process variables are under your control. The variables are water temperature, grind, amount of coffee and amount of water.

When you follow our printed instructions you make espresso-strength brew, which is 4 times more concentrated than American coffee. Our instructions are to dilute this concentrate with water to make American coffee or with milk to make a latte.

Some people are surprised that we press espresso-strength, then dilute. But that makes the smoothest brew. Pressing all of your water through the grounds will taste more bitter.

If you would like to experiment, here are some ideas:

  • For richer strength, use more coffee and/or finer grind.
  • For more "bite", use hotter water. But keep in mind that in our blind-tasting tests, coffee professionals and every-day coffee lovers preferred AeroPress brew made with 175F (80C) water. So try that first.

It takes 17 minutes for a small kettle to cool down from boiling to the optimum 175F. The easiest way to get the right temperature is with an adjustable-temperature electric kettle which stops heating at your set temperature. It's fast and consumes less energy than bringing the water to a boil.

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I was surprised to learn that the AeroPress can be used to brew cold brew. Do you drink cold brew and if so, how?

I enjoy drinking cold-brewed American coffee or lattes at room temperature. But you can also chill the brew with ice or heat it in your microwave oven if you wish.

You should definitely try our cold brew instructions. It only takes a minute longer and you'll be amazed at how delicious it tastes.

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What's the best grind for AeroPress?

Ordinary drip grind is about right for pressing 3 scoops. But for single servings, espresso grind will give you more flavor for your money. I often set a grinder about halfway between drip and espresso. You can do that at home if you grind at home, or with the your store's grinder.

If pressing takes longer than 60 seconds, use a coarser grind. If it presses faster than 30 seconds, a finer grind will give richer flavor for the same amount of coffee.

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How long does your pressing take?

It takes 30 to 60 seconds, depending on the amount of coffee and the fineness of grind.

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Why press gently?

Pressing gently is fastest. And fastest gives the smoothest brew. If you press too hard it compacts the bed of coffee and blocks the flow. I like to press into a clear mug and see individual drops fall. That's about 12 pounds of force.

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