Hario Cold Brew: Review & Recipe

The Hario Mizudashi is the simplest dedicated cold brew maker on the market — a 1 L glass bottle with a long fine-mesh filter that drops down the center. You scoop coffee into the filter, top with water, lid on, and put it in the fridge. No second strain. No grounds floating in the cup. It's the cold brew gear that fits in a fridge door. Below: an honest review of what it does well and where it falls short, plus the exact recipe that fits its 1 L capacity.

What the Hario Mizudashi is

The Mizudashi (Japanese for "cold-drawn") is a 1 liter borosilicate-glass bottle with a removable polypropylene lid and a long, cylindrical fine-mesh filter that hangs from the lid down the center of the bottle. You fill the filter with coarse-ground coffee, fill the bottle with water, and the coffee steeps in the water while staying contained behind the mesh. When the brew is done, you lift out the filter, dump the spent grounds, and the bottle becomes your storage container.

Hario makes the Mizudashi in two sizes — a smaller 600 ml model and the standard 1 L model — and several colorways for the lid. The 1 L is the one almost everyone buys; it makes enough cold brew for a couple of days for one drinker, or one day for two. List price hovers around $25.

Honest review: what it does well, where it falls short

What it does well

One-step brewing. No mason jar plus separate strainer plus separate storage. The bottle is the brewer, the filter is built in, and the bottle is the storage. Total cleanup is rinsing the filter under hot water.
Fridge-door form factor. The bottle is tall and narrow — about 5 inches at the base, 11 inches tall — so it fits in a standard fridge door slot. A mason jar of equivalent capacity is much wider.
Clean cup. The fine-mesh filter catches almost all the silt. The cup is noticeably cleaner than a French Press cold brew and on par with a double-strained mason jar brew. No coffee filter or second pass required.
Easy to dial in. Because the geometry is fixed (1 L water, mesh filter, etc.), the recipe doesn't change. Once you've made a brew you like, it's the same recipe every time.

Where it falls short

Capacity is limiting. 1 L makes about four standard servings of finished cold brew. If you drink cold brew daily or share with a partner, you'll be brewing constantly. A 2 L mason jar is the same effort and twice the output.
Glass is fragile. Drop it on a tile kitchen floor and you'll be buying a new one. The Toddy and OXO plastic alternatives survive a kitchen better.
Mesh can clog with too-fine grinds. If your grinder produces a lot of fines (most blade grinders, some entry-level burrs), the filter can get sluggish to drain. Coarse grind is mandatory.
Doesn't fit large jars of ice. You can't put ice directly in the bottle for a flash-chill — the filter takes up the space. You serve out of the bottle into an iced glass.

Who should buy it

The Mizudashi is the right pick if you (a) make cold brew once or twice a week rather than daily, (b) want minimum cleanup, and (c) value the fridge-door form factor. If you make cold brew in large batches, a 2 L mason jar with cheesecloth (or a Toddy system) saves time. If you already own a French Press, you can cold-brew in that and skip the Mizudashi entirely.

The 1 L Hario Mizudashi recipe

The Mizudashi's geometry locks in the recipe — you have exactly 1 liter of water capacity and a fixed-volume filter. This recipe is sized for that and tested to produce a clean, balanced concentrate.

Variable	Value
Coffee	80 g, coarse grind
Water	800 g, cold or room temperature
Ratio	1:10
Steep time	14 hours (fridge)
Yield	Roughly 750 ml light concentrate, 6 servings diluted

Why 1:10 instead of the standard 1:8? Because the Mizudashi's filter geometry means the coffee sits in a column rather than dispersing through the water — extraction is slightly less efficient than a fully suspended brew. The 1:10 ratio compensates by giving the water more access to the grounds, and the slightly shorter 14-hour steep balances out for the column geometry. The end result is a clean, balanced concentrate that dilutes well with ice or milk.

Step-by-step

Weigh and grind 80 g of coffee. Coarse grind — about the texture of kosher salt. The Mizudashi's mesh is fine, but it can clog if your grinder produces a lot of fines. A burr grinder is essential.
Pull the filter out of the bottle and add the grounds. The filter has a fill line; 80 g of coarse grounds comes up to it. Tap the filter gently to settle the grounds. Don't pack them down.
Lower the filter back into the bottle and pour water through it. Pour 800 g of cold or room-temperature filtered water slowly through the filter so the water passes through the grounds on its way in. This saturates the bed evenly.
Top off and seal. If the water level is below the fill line on the bottle, top it off to 800 g. Twist the lid on firmly.
Steep in the fridge for 14 hours. Lay the bottle on its side if you want extra contact (just don't lay it on the lid). Most people stand it upright in the fridge door — that's the standard method and it works fine.
Lift the filter out, drain it back over the bottle, and discard the grounds. Let the filter drip for thirty seconds before removing — that's where the last of the concentrate is. Compost the grounds.
Cap the bottle and refrigerate. To serve, pour about 4 oz of concentrate over a tall glass of ice, then top with 4 oz of cold water or milk. Keeps in the fridge for ten to fourteen days.

Pro tips for the Mizudashi specifically

If your brew is consistently weak, tighten the ratio to 1:8 (100 g coffee + 800 g water). The Mizudashi's column geometry is slightly less efficient than a fully suspended brew, so the standard 1:8 from the cold brew hub produces a stronger cup in this device.
If the filter drains slowly, your grind is too fine. Coarsen by two clicks on your burr grinder.
If the brew tastes dusty, rinse the filter more thoroughly between brews. Coffee oils accumulate on the mesh and can carry over.
Don't put the lid on the bottle while still inserting the filter. The filter has to go in first or you'll cross-thread the lid.

Best coffee for the Mizudashi

The Mizudashi's clean filtration shows off coffee with chocolate, nut, and caramel notes. Our three picks (in priority order):

Cerrado Catuai — Brazil natural. The default. Cocoa-forward, sweet, mellow acidity. 1:10 standard.
Argelia Cauca — Colombia washed. Toffee, balanced sweetness. Cleaner profile that pairs beautifully with milk. 1:10 standard.
Dembi Sidama — Ethiopia natural. Wine, berry, dark-chocolate complexity. Try at 1:9 for a more concentrated cup that lets the fruit through.

Cleaning the Mizudashi

Every brew: dump grounds (compost), rinse the filter under hot water, rinse the bottle, air-dry both. The mesh is fine enough that a soft-bristle brush helps clear oils.

Weekly: hand-wash the bottle and filter with hot soapy water. The lid and filter cap are dishwasher-safe; the bottle is rated for the top rack but borosilicate glass survives longer with hand-washing.

Monthly: soak the filter in a 1:4 vinegar-water solution for an hour to clear coffee-oil buildup. Rinse thoroughly. Replacement filters are available from Hario for about $10 — replace when the mesh starts to distort.

Mizudashi vs other cold brew makers

Mizudashi vs Toddy

Toddy makes more cold brew at once (up to 2 quarts of concentrate) and uses a paper filter instead of mesh — slightly cleaner cup. But the Toddy is bigger, plastic-bodied, and the setup is messier (filter has to be wedged in correctly). Mizudashi wins on ease and form factor; Toddy wins on volume and absolute cleanliness.

Mizudashi vs French Press cold brew

A French Press cold brew is cheaper if you already own a press, and the press's larger capacity makes more brew per batch. The trade-off is the cup has a little more body and a little more silt — the metal mesh on the plunger isn't as fine as the Mizudashi's filter. See the French Press Coffee Guide for the press method.

Mizudashi vs mason jar

A 2-quart mason jar with cheesecloth costs $6 and brews twice the volume. The trade-off is two pass-strains (sieve, then filter), which is messy and time-consuming. Mizudashi is the right pick if you value the one-step workflow over capacity or cost.

Hario Mizudashi FAQ

What's the right ratio for the Hario Mizudashi?

Start with 80 g coffee + 800 g water (1:10) for a 14-hour fridge steep. If the brew is too weak for your taste, tighten to 1:8 (100 g + 800 g). The Mizudashi's column geometry is slightly less efficient than a fully suspended brew, so it benefits from a tighter ratio than the standard mason jar method.

How long does Hario cold brew last?

Ten to fourteen days in the sealed Mizudashi bottle in the fridge. The bottle's airtight lid is part of why it stores so well. Once you've poured concentrate into a glass with water or milk, drink it within twenty-four hours.

Can you use pre-ground coffee in the Mizudashi?

You can, but it's the wrong choice. Pre-ground coffee oxidizes within hours, and a 14-hour cold steep amplifies the staleness. The mesh can also clog faster with the fines that pre-grinding produces. Grind whole beans coarse, right before you brew.

Is the Hario Mizudashi worth it?

If you make cold brew once or twice a week and value minimum cleanup plus a fridge-door form factor, yes — it's $25 well spent. If you make cold brew daily or in batches, a 2 L mason jar costs less and brews more. If you already own a French Press, you can skip the Mizudashi entirely and brew in the press.

Can you make hot coffee in the Mizudashi?

No — it's not rated for boiling water and the polypropylene lid can deform. The Mizudashi is purpose-built for cold extraction. For hot brewing, use a separate kettle and brewer.

What grind size for the Mizudashi?

Coarse — kosher salt texture. The mesh filter is finer than a French Press plunger, but fines still slow the drain and can sneak through. If you've dialed in a French Press grind on your burr grinder, that setting works for the Mizudashi too.

Why is my Mizudashi cold brew weak?

Three likely causes: ratio too loose (tighten from 1:10 to 1:8), grind too coarse (go one click finer), or steep time too short (extend from 14 to 18 hours). Try one change at a time.