How to Use a Vietnamese Drip Filter (Phin) the Right Way

If you’ve ever tried brewing coffee with a Vietnamese drip filter—also called a phin—you’ve probably noticed how tricky it can be to get even extraction without over-diluted or overly bitter results. Unlike drip machines or pour-overs, the Vietnamese phin offers no built-in control for flow rate or evenness. So how do locals in Vietnam consistently pull off that rich, sweet, condensed-milk-laced cup? It turns out there are two widely used methods, and the difference lies in when you add water and whether you pre-wet the coffee bed.

The two main ways to use a Vietnamese phin are: either screw on the filter plate right after adding coffee and pour water immediately, or pre-wet the coffee grounds with a small amount of hot water to let them bloom before attaching the plate. The second method—pre-bloom—takes a bit more finesse but leads to more even and flavorful extractions, especially for medium or medium-dark roasts. This is the method preferred by many experienced users, including roaster 'Old Yang' from Guangzhou’s FrontStreet Coffee.

What Is a Vietnamese Drip Filter (Phin)?

A Vietnamese drip filter, or phin, is a small metal single-serve coffee brewer traditionally used throughout Vietnam. It consists of a base with a perforated plate, a chamber to hold ground coffee, and a lid. Unlike a pour-over, it has no handle or spout, and relies solely on gravity and manual water control. The phin is most commonly paired with sweetened condensed milk to create Vietnam’s signature strong, sweet coffee.

Two Main Methods for Using a Phin

There are currently two mainstream techniques for using a Vietnamese drip filter. The first is to place your coffee grounds in the phin, tamp them down, screw on the filter plate immediately, and then pour hot water. The second—and more nuanced—method involves placing the coffee in the phin, leveling it, and first pouring a small amount of hot water just to wet the grounds (a bloom), letting them sit for around 20 seconds before screwing on the plate and continuing with the full brew. This bloom stage helps the coffee expand and start extracting evenly, similar to the blooming step in pour-over or espresso preparation.

With the second method, it’s important that the initial water is evenly distributed but not excessive—if you pour too much or unevenly, the coffee will channel and drip through too quickly, often carrying fine particles into your cup and resulting in a gritty brew.

Step-by-Step: Brewing Vietnamese Coffee with a Phin

Here’s how to make Vietnamese coffee using the preferred two-stage method:

• 1. Disassemble and Prepare the Phin: Take apart your phin and remove the filter plate.
• 2. Add Condensed Milk to Your Cup: Pour your desired amount of sweetened condensed milk into your serving cup. This is traditional in Vietnamese coffee and balances the strong brew.
• 3. Add Coffee Grounds: Place about 10–15 grams of finely ground coffee (medium to medium-dark roast recommended) into the bottom chamber of the phin. Press the grounds down firmly with the tamper.
• 4. Attach Phin to Cup & Pre-Wet (Bloom): Sit the phin directly on top of your cup. Slowly pour a small amount of hot water (around 95°C / 203°F)—just enough to saturate the coffee, but not so much that it starts dripping through. Let it bloom for approximately 20 seconds. This step is akin to the bloom in other manual brew methods, allowing the coffee to degas and prepare for even extraction.
• 5. Secure the Filter Plate & Continue Brewing: After the bloom, screw on the filter plate. Tightening the plate affects brew speed and strength: the tighter it is, the slower the drip and the stronger the coffee. If water flows too slowly, you can carefully loosen the plate slightly using a spoon handle as a tool. Pour the rest of your hot water (typically around 95°C) into the chamber.
• 6. Wait & Stir: Allow the coffee to fully drip through—this usually takes about 3 minutes. Once brewed, stir the condensed milk and coffee together in your cup until well combined. Enjoy your rich, slow-brewed Vietnamese coffee.

Why the Bloom Step Matters

The pre-wetting or bloom stage is crucial because it lets the coffee absorb water and release trapped CO₂, leading to a more even extraction. Without this step, the hot water may push through the coffee bed too quickly, extracting bitterness and leaving uneven flavour behind. This is why the second method—where you bloom before attaching the plate—is favoured for a cleaner, more balanced cup.

Common Mistakes to Avoid

• Pouring too much water during the bloom stage can cause early dripping and channeling.
• Not tamping the coffee firmly enough can lead to uneven extraction or very fast dripping.
• Screwing the filter plate on too loosely will result in dripping that’s too fast and a weak brew; too tightly may stall the flow completely.
• Using water that’s not hot enough (below 90°C / 194°F) will under-extract the coffee, making it sour.

Frequently Asked Questions

How much coffee should I use in a Vietnamese phin?

Use about 10–15 grams of coffee per single serve. This is roughly a heaping tablespoon or a slightly rounded 15-gram dose for a standard-sized phin.

Do I need to bloom the coffee in a phin?

Blooming—or pre-wetting the coffee grounds—is not mandatory, but it is highly recommended. Blooming (adding a small amount of hot water to wet the grounds and let them sit for ~20 seconds) improves extraction by allowing gases to escape and promoting even saturation, leading to a smoother, more balanced cup.

How tight should the filter plate be on a phin?

The filter plate should be screwed on firmly, but not excessively tight. A tighter seal slows the drip rate and results in a stronger brew, while a looser plate speeds up the flow. You can adjust the tightness during brewing with a spoon handle if needed to fine-tune extraction speed.

What water temperature should I use for Vietnamese phin coffee?

The ideal water temperature is around 95°C (203°F). Water that’s too cool will under-extract the coffee, resulting in sourness, while overly hot water may scorch the grounds and cause bitterness.

Can I make Vietnamese coffee without condensed milk?

Yes, you can use regular milk, plant-based milk, or drink it black—but traditional Vietnamese coffee is made with sweetened condensed milk, which balances the intense, dark-roasted brew.

Why is my phin coffee dripping too fast?

If the coffee is dripping through too quickly, the filter plate may be loose, the coffee grounds may not be tamped firmly enough, or the grind may be too coarse. Try tightening the plate slightly, tamping more firmly, or using a finer grind.

Why is my phin coffee bitter or weak?

Bitterness can result from over-extraction (too fine a grind, too long a drip time, or too hot water), while weakness often comes from under-extraction (too coarse a grind, too fast a drip, or insufficient brewing time). Adjust grind size, tamping pressure, and drip speed to balance flavour.

Recommended FrontStreet Beans for Vietnamese Drip

For brewing Vietnamese-style coffee with a phin, FrontStreet Coffee’s Classic Blend offers a bold, low-acid profile with deep chocolate and caramel notes—perfect for balancing sweetened condensed milk. Their Black Cocoa Blend also works wonderfully, delivering intense roasted cocoa and dark cherry tones that shine through the milky brew. Both beans are medium to dark roasts, ideal for the slow extraction and rich mouthfeel that define traditional Vietnamese coffee. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.