How to Use a Phin Filter

The complete guide to brewing Vietnamese phin coffee at home — grind size, water temperature, step-by-step method, and troubleshooting.

Buy a Phin Filter

The Phin Filter: Vietnam's Most Important Coffee Tool

The phin filter (cà phê phin) is the defining tool of Vietnamese coffee culture. It's simple, elegant, and produces a cup that's unlike anything from an espresso machine or a drip brewer.

The phin was developed in Vietnam during the French colonial era as a practical adaptation of French drip coffee. It requires no electricity, no paper filters, and no special equipment — just hot water and good coffee.

A standard phin consists of four parts: the chamber (where the coffee goes), the gravity press (which sits on the grounds), the lid (which keeps the heat in), and the base plate (which sits on your cup). The whole thing costs under $10 and lasts for years.

What You Need to Brew Phin Coffee

A Phin Filter

A traditional Vietnamese metal phin filter. Size 6 (for one cup, ~120ml) is the most common. Available at Hanoi Drip or online.

Vietnamese Robusta Coffee

Medium-coarse ground robusta. We sell our house blend pre-ground for phin brewing at all three locations.

Hot Water at 90–95°C

Just off the boil. A kettle with temperature control is ideal, but letting boiling water sit for 30 seconds works too.

Grind Size Guide for Phin Coffee

Getting the grind right is the single most important variable in phin brewing. The phin's metal filter has small holes that can clog with fine grounds or allow fast, weak extraction with coarse grounds.

Target grind: Medium-coarse — similar to coarse sea salt or slightly finer than French press grind. On a Baratza Encore, this is around setting 20–25. On a Hario hand grinder, 3–4 clicks from the tightest setting.

How to diagnose your grind: If your brew finishes in under 3 minutes, go finer. If it takes more than 7 minutes, go coarser. The sweet spot is 4–5 minutes for a 100–120ml brew. If the coffee tastes sour or thin, it's under-extracted (too coarse or too short). If it tastes bitter and harsh, it's over-extracted (too fine or too long).

Pre-ground coffee: If you don't have a grinder, buy our house robusta blend pre-ground for phin brewing. We grind it specifically for the 4–5 minute extraction window.

Step-by-Step Phin Brewing Instructions

Step 1 — Set up: Place the phin filter base on your cup or glass. If brewing Ca Phe Sua Da (iced coffee with condensed milk), add 2–3 tablespoons of sweetened condensed milk to the bottom of the glass first.

Step 2 — Add coffee: Add 2–3 tablespoons (15–20g) of medium-coarse ground robusta to the phin chamber. Tap gently to level the grounds.

Step 3 — Place the gravity press: Set the gravity press on top of the grounds. Press gently — it should rest with its own weight, not be forced down. If you press too hard, the water won't drip through.

Step 4 — Bloom: Pour 30ml of hot water (90–95°C) over the grounds. Wait 30 seconds. You'll see the coffee swell slightly as CO2 releases — this is the bloom, and it ensures even extraction.

Step 5 — Brew: Pour the remaining 100–120ml of hot water slowly and evenly. Place the lid on the phin.

Step 6 — Wait: The coffee will drip through over 4–5 minutes. Don't rush it or press down on the filter. The slow drip is what gives phin coffee its concentrated, full-bodied character.

Step 7 — Serve: Remove the phin filter. If you've added condensed milk, stir well. Add ice for Ca Phe Sua Da, or drink straight as Ca Phe Den (black phin coffee).

Phin vs French Press vs Pour Over: Which Is Right for You?

The phin, French press, and pour over are all manual brewing methods, but they produce very different cups. Here's how they compare:

Phin filter: Produces 100–120ml of concentrated, full-bodied coffee. Metal filter preserves coffee oils. Slow (4–5 minutes). Ideal for Vietnamese coffee drinks (Ca Phe Sua Da, egg coffee). Portable and inexpensive. Best for: Vietnamese coffee, condensed milk drinks, small concentrated servings.

French press: Produces 300–400ml of full-bodied, textured coffee. Metal filter preserves oils. Faster (4 minutes total). More sediment in the cup. Best for: larger servings, bold coffee, drinking black or with milk.

Pour over (V60, Chemex): Produces 250–400ml of clean, bright coffee. Paper filter removes oils. Faster (3–4 minutes). Cleaner cup with more acidity. Best for: light and medium roasts, specialty coffee, highlighting origin flavours.

Our recommendation: If you want to make authentic Vietnamese coffee drinks at home, the phin is the right tool. If you want a larger cup of bold black coffee, the French press is a good alternative. If you prefer light, bright coffee, pour over is the better choice.