A medium-dark roast that you expected to have plenty of depth goes through a familiar V60 routine: grinding, blooming, and pouring. The coffee has no obvious bitterness or astringency, and the aroma is still there, yet the first sip feels as if a layer is missing: the flavor disperses quickly, the finish arrives early, and you are left thinking, “It seems a little thin.”
When you run into this gap, it is easy to wonder: is the grind or coffee-to-water ratio still not dialed in, or is the V60 you are using a poor fit for these beans?
Do not rush to change drippers. “Thin” can point to at least three different things; if you have not first worked out whether the missing element is coffee strength, extraction level, or body, changing the filter paper, coffee bed, and pouring method can make it even harder to tell where the problem lies.
Which kind of “thin” do you mean?
When drinking coffee, few people start by thinking about TDS or extraction yield. Most people simply know that the cup is not as full as they expected. Start by noticing the differences below; there is no need to diagnose the coffee too quickly.
| How the cup feels | The issue it most closely resembles | First comparison to try |
|---|---|---|
| The whole cup tastes weak, without pronounced acidity, bitterness, or astringency | The coffee strength may be low | Keep the other settings the same and try a version with slightly less total water or slightly more coffee grounds |
| There is a sour, salty, or hollow sensation on the first sip, the finish is very short, and the flow is faster than usual | The extraction may be incomplete, or the flow may be too fast | Adjust only one variable: grind size or pouring method |
| The aroma and flavor are clear, and the sweetness is still there, but the mouthfeel is light | This is more likely a preference for greater body; the brew itself may not be unbalanced | First confirm that this is simply the clear profile of the beans and recipe, then consider another dripper setup |
| It is bitter, dry, or astringent, yet still feels hollow | You may not need to grind finer or brew longer | Return to the last setting that produced a drinkable cup, and check for uneven wetting, excessive agitation, or pouring along the filter paper |
Here, “coffee strength” means how concentrated or dilute the finished drink is; “extraction level” means how much soluble material was drawn from the coffee grounds during brewing; body is the weight, coating, and viscosity you feel on the palate. These three affect one another, but they cannot be addressed with the same answer. The dripper is only one factor affecting the brewing result.
So when someone says a cup is “thin,” we still do not know whether to change the coffee-to-water ratio, the grind, or simply pursue a different mouthfeel; that description alone cannot show that the V60 was the wrong choice.
Before buying a new dripper, give your V60 one more chance
Do not start by searching for the most popular brew time online. Treat today's cup as your baseline: note the coffee dose, total water, grind, water temperature, filter paper, and general pouring method, then change only one variable in the next cup.
If the whole cup is simply too dilute, make a small comparison by adjusting the coffee-to-water ratio; if it is sour and hollow and the water passes quickly through the coffee bed, adjust either the grind size or the pouring method. The key is to change only one thing at a time—do not grind finer, use less water, raise the temperature, and change the pour stages all at once. Otherwise, even if the next cup improves, you will not know which action was worth keeping.
You do not need to watch only the total brew time while drinking. Let the coffee cool slightly and note, in order: whether it has weight on the palate, whether the flavor still connects through the middle, whether the finish is sweet or dry, and whether the whole cup makes you want to keep drinking more than the previous one.
If one adjustment has already brought the coffee back in the direction you want, the answer is simple: keep using the V60. You do not need to buy another dripper to fix this brew.
When is it worth trying a Kalita 155?
If you already have a V60, it is entirely reasonable to keep using it to adjust a medium-dark roast. The V60's 60-degree cone, spiral ribs, and single large hole leave room to adjust grind size, pouring speed, and pulse-pour pattern.
Once the V60 can consistently produce a cup without obvious imbalance, and you still want to explore a brewing approach you use less often, the Kalita Wave 155 is worth adding to the comparison. It uses a flat-bottom bed, three holes, and dedicated Wave filter paper, so its brewing rhythm differs from the V60. The question is whether those differences address the first-sip weight, the character through the middle and finish, or the roundness you want.
Before adding a 155 to the comparison, confirm three things:
- You can already reproduce a cup without obvious imbalance using the V60;
- You want to compare first-sip weight, character through the middle and finish, or overall roundness—not just increase coffee strength;
- You are willing to get used to the Wave 155's filter paper and recipe rather than carry the V60 recipe over directly.
Online, the Wave is often described as “thicker” and “sweeter,” but real-world reports are inconsistent. Some people find the mouthfeel rounder; others find the flavor flatter and duller, or even the mouthfeel too heavy. That disagreement is useful: it reminds us that a dripper can change brewing conditions, but cannot decide the answer in advance for every bag of beans.
Where the 155 fits into Coffee Stage's daily brewing
Under our usual grinding and pouring rhythm, one common starting point for the WDC-155 and WDS-155 is 20g of coffee grounds, a 1:15 coffee-to-water ratio, and about 300g of total water. We use this approach more often with medium to dark roasts, paying attention to depth in the cup, layers through the middle and finish, and sweetness.
This experience explains why we keep a 155 on the equipment shelf. It reflects Coffee Stage's daily brewing conditions, not an official Kalita recipe; our comparison with the V60 was not a controlled test. Change the beans, grind, filter paper, pouring, or drinking temperature, and the result may change with them.
Compare at home without rushing to declare a winner
If you can borrow a 155, or have already decided to make it a second tool, divide the comparison into two rounds.
In the first round, keep the same beans, coffee dose, type of water, and roughly the same temperature. Use the correct filter paper for each dripper and brew with a similar, simple pouring rhythm. This round is not about perfection; it is simply to see whether there is a difference worth pursuing in first-sip weight, mid-palate and finish, sweetness, or clarity.
If one cup's flow rate is clearly abnormal, only then make a small grind or pouring adjustment for that dripper in the second round. At this point, simply note which cup is closer to the direction you want today after dialing each one in to a state you would happily drink.
It is best to write down the answers:
- Does the first sip feel light or round, or does it leave a more noticeable coating sensation?
- Does the flavor connect through the middle?
- After cooling, how do the sweetness, dryness, astringency, and clarity change?
- Which cup would you want to brew again?
If there is no clear difference between the two cups, that is also a complete answer. For now, you can work on the coffee beans, grind, or water; there is no need to add equipment yet.
Only choose between WDC and WDS once you are sure you want the flat-bottom route
If the V60 recipe is already stable and you still want to keep a Wave 155 brewing setup, only then is it time to choose a product.
WDC-155 is made of copper and weighs about 140g; WDS-155 is made of stainless steel and weighs about 120g. Both have the same official body dimensions of 130×100×58mm and both use KWF-155 Wave filter paper.
Material affects weight, preheating, and daily care, but copper or stainless steel alone cannot predict a fixed flavor in the cup. When choosing, consider which one you are more willing to preheat, clean, and maintain each day, and set aside the assumption that one will always be sweeter or fuller.
In the end, return to that first cup of coffee: if adjusting the V60 has already brought back the body you wanted, stop there; if you have confirmed that you want to explore a different coffee bed, filter paper, and mouthfeel direction, the Kalita 155 now has a clear role—to become another tool you can compare over the long term.
Frequently asked questions
Is 20g of coffee grounds necessarily right for a Kalita 155?
Kalita officially lists the 155 for 1–2 people, but does not set a hard capacity limit at 20g. 20g, 1:15, and about 300g are simply one of Coffee Stage's daily brewing approaches; the official guidance does not define this as a maximum, and in practice you still need to judge it together with the grind, pouring, and available room to work.
Will the Wave 155 clog less often than a V60?
That cannot be guaranteed. Filter paper, fines, grind size, pouring agitation, and dripper design all affect flow rate. If drainage suddenly slows, first check what you changed in this brew rather than judging by the dripper name alone.
Which is guaranteed to produce more body or sweetness, the WDC-155 or the WDS-155?
There is not enough evidence to predict a fixed flavor from the material alone. The most direct differences we can confirm are material and weight; to compare the result in the cup, record preheating and recipe conditions together.
Can I put V60 02 filter paper in a Kalita 155?
They are different filter-paper systems. The official pairing for WDC/WDS-155 is Wave 155 filter paper; when buying, treating the dripper and filter paper as one system will make results easier to reproduce than improvising folds with a different filter shape.
Product specifications and filter-paper pairings were checked against the official information for the Kalita Wave series, WDC-155, WDS-155 and HARIO V60 in September 2026. The cup descriptions in this article come from team observations under specific conditions and a reader comparison method; they do not represent a fixed flavor or effect.
