Immersion brewer
Ovalware RJ3 Airtight Cold Brew Maker (1.5L): ratio and recipe
125g coffee1,188mL water
That is an everyday batch at 1:9.5, steeped 18–22 hours in the fridge and poured straight over ice. Holds 1,500 mL of water and takes up to 125 g of coffee.
The maker’s own recipe
1:13.6110 g coffee1,500 mL watersteep 12–18 h
This is the recipe Ovalware publishes for this brewer, and it is what Cold Brew Studio opens with when you pick it. It makes about 5½ cups, best straight over ice.
How the maker does it
Fill the removable stainless-steel mesh filter about 5/6 full with 110g of coarsely ground coffee (extra-coarse/French-press style). Pour room-temperature filtered water slowly and evenly into the carafe up to the MAX fill line (1,500ml/1.5L), then stir gently so all grounds are evenly saturated. Place in the fridge with the lid on and steep 12-18 hours (Ovalware's own 'sweet spot' is 14-16h; up to 24h for a stronger batch; room-temperature steeping instead takes only 8-12h for a slightly stronger brew). The result is ready-to-drink at this ratio — no dilution needed unless you prefer it lighter — served straight over ice or cut with water, milk, oat milk, or cream to taste. Store in the airtight carafe in the fridge up to 2 weeks.
Source: ovalware.com
The recipe, by strength
Each one fills this brewer as far as it honestly goes. Numbers are for a light roast steeping in the fridge.
| Strength | Ratio | Coffee | Water | Steep | Makes | Drink it |
|---|---|---|---|---|---|---|
| Everyday | 1:9.5 | 125 g | 1,188 mL | 18–22 h | about 4 cups | straight over ice |
| Strong | 1:7.5 | 125 g | 938 mL | 18–22 h | about 3 cups | with a splash of milk |
| Jet fuel | 1:5.3 | 125 g | 663 mL | 18–22 h | about 2½ cups | cut with a little water or milk |
| Concentrate | 1:4.5 | 125 g | 563 mL | 18–22 h | about 2¾ cups | mixed 1:1 with water or milk |
If your beans are darker
Darker roasts give up their flavor faster, so they brew at a slightly wider ratio and steep for less time.
| Roast | Ratio | Coffee | Water | Steep in the fridge |
|---|---|---|---|---|
| Light | 1:9.5 | 125 g | 1,188 mL | 18–22 h |
| Medium | 1:10 | 125 g | 1,250 mL | 14–18 h |
| Dark | 1:10.5 | 125 g | 1,313 mL | 10–14 h |
Everyday strength shown.
How it goes
- Grounds in the basket.
- Water over, slowly.
- Stir once.
- Lid on, into the fridge.
Grind coarse, about the size of coarse sea salt. Find the number for your grinder.
Good to know
Uses a fine stainless-steel mesh filter basket (not paper) — wants a coarse, French-press-style grind, since finer grounds slip past the mesh and cause sediment/bitterness. Brews at a stronger, ready-to-drink ratio (about 1:13.6) rather than a concentrate meant for dilution.
This brewer takes about 125 g of coffee at most. Stronger recipes can’t add more grounds, so they use less water instead. That is why every strength comes in under the full 1,500 mL.
Let the app keep track.
Cold Brew Studio sizes every batch to your Ovalware RJ3 Airtight Cold Brew Maker, tells you when it is ready, and adjusts the recipe when you rate how it tasted.
Free on iPhone and the web. No account needed.
Quick answers
- How much coffee do I use in the Ovalware RJ3 Airtight Cold Brew Maker (1.5L)?
- For an everyday strength, 125 g of coffee to 1,188 mL of water, a 1:9.5 ratio. For a concentrate, 125 g to 563 mL.
- How long do I steep cold brew in the Ovalware RJ3 Airtight Cold Brew Maker (1.5L)?
- 18–22 hours in the fridge for a light roast, 14–18 for medium and 10–14 for dark. On the counter, 12–14, 9–12 and 7–9 hours.
- What ratio does the maker recommend for the Ovalware RJ3 Airtight Cold Brew Maker (1.5L)?
- 1:13.6, which is 110 g of coffee to 1,500 mL of water, steeped 12–18 hours.