Make Concentrate With Genuinely Low Acid Coffee
House Blend Ground · 2.5lb Shop Now |
Dark French Roast Ground · 2.5lb Shop Now |
Mocha Java Ground · 2.5lb Shop Now |
Cold brew concentrate is the most versatile coffee format available. One batch lasts two weeks in the refrigerator and becomes iced coffee, hot coffee, lattes, cocktail mixers, or baking ingredients on demand. It is also significantly more economical than buying pre-made concentrates from Starbucks, Stumptown, or La Colombe — and when made with Puroast, it's the only concentrate format that is genuinely, verifiably low acid.
Important: Cold brew concentrate is NOT inherently low acid. Rao & Fuller (Scientific Reports, 2018) found cold brew pH (4.96–5.13) is statistically comparable to hot brew (4.85–5.10). The coffee you use determines acidity — not the brew method. For genuinely low acid concentrate, use Puroast (verified pH 5.74–5.82).
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2 weeks Concentrate shelf life refrigerated |
~$1.50 Cost per 32oz vs $10 store-bought |
1:4 The master concentrate ratio |
The Perfect Cold Brew Concentrate Ratio
| Batch Size | Coffee | Water | Steep | Yield |
|---|---|---|---|---|
| Small | ½ cup (42g) | 2 cups (475mL) | 18–24 hrs | ~1.5 cups concentrate |
| Standard | 1 cup (85g) | 4 cups (950mL) | 18–24 hrs | ~3 cups concentrate |
| Large Batch | 2 cups (170g) | 8 cups (1.9L) | 18–24 hrs | ~6 cups concentrate |
Step-by-Step: Making Cold Brew Concentrate
1. Grind coarsely (French press setting). Add to a large jar or pitcher.
2. Pour cold filtered water over the grounds. Stir to saturate fully.
3. Cover and refrigerate for 18–24 hours.
4. Strain twice — first through a fine mesh strainer, then through cheesecloth or a paper coffee filter.
5. Transfer strained concentrate to a sealed glass jar. Refrigerate up to 2 weeks.
6. To serve: dilute 1:1 with water or milk over ice. Adjust to taste.
Pro Tip — Strain Twice: The difference between cloudy and crystal-clear concentrate is a double straining. First pass: fine mesh strainer. Second pass: paper coffee filter or fine cheesecloth. The extra 5 minutes produces a barista-quality concentrate with no sediment or bitter fines.
10 Ways to Use Cold Brew Concentrate
1. Classic Iced Coffee — Dilute 1:1 with cold water over ice. Clean, smooth, zero waste.
2. Cold Brew Latte — Dilute 1:1 with oat milk, almond milk, or dairy over ice. Richest possible result.
3. Hot Coffee Shortcut — Dilute 1:1 with hot water. Instant, smooth hot coffee with no brewing required.
4. Brown Sugar Latte — Concentrate + brown sugar syrup + oat milk + ice. Starbucks at home for $0.60.
5. Coffee Tonic — 2oz concentrate over tonic water + ice + orange slice. Refreshing, zero sugar.
6. Protein Coffee — 3oz concentrate + 1 scoop protein powder + 8oz oat milk blended with ice.
7. Coffee Cocktail — 2oz concentrate + 1.5oz bourbon or vodka + ice. The simplest espresso martini variation.
8. Coffee Ice Cubes — Pour concentrate into an ice cube tray. Freeze. Use in lattes to prevent dilution.
9. Coffee Smoothie — 3oz concentrate + frozen banana + oat milk + cocoa powder in a blender.
10. Baking and Cooking — Use undiluted in brownies, tiramisu, coffee cakes, or BBQ marinades. Adds deep coffee flavor without bitterness.
Best Puroast Varieties for Concentrate
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House Blend — Iced Latte Base Smooth, versatile, dilutes beautifully Shop Now |
Dark French Roast — Boldest Concentrate Deep, intense — ideal for recipes & cocktails Shop Now |
Mocha Java — Rich & Chocolatey Exceptional for mocha lattes & tiramisu Shop Now |
Store-Bought vs. Homemade: The Full Cost Breakdown
| Brand | Cost/32oz | Verified Low Acid? | Antioxidants |
|---|---|---|---|
| Starbucks Cold Brew Concentrate | $9.99–11.99 | ❌ No (pH ~5.0) | Standard |
| Stumptown Holler Mountain | $8.99–10.99 | ❌ No | Standard |
| La Colombe Draft Latte | $12.99–15.99 | ❌ No | Standard |
| Javy Coffee Concentrate | $14.99–17.99 | ❌ No | Standard |
| Homemade Puroast Concentrate | ~$1.50–2.00 | ✅ LACCSA Certified pH 5.82 | 5X More |
Frequently Asked Questions
Use a 1:4 ratio — 1 cup of coarsely ground coffee to 4 cups of cold water. Steep for 18–24 hours in the refrigerator. Strain twice. Dilute 1:1 with water or milk before serving.
Properly strained cold brew concentrate lasts up to 2 weeks refrigerated in a sealed glass jar. Once diluted, consume within 3–5 days.
No. Peer-reviewed research (Rao & Fuller, 2018) found cold brew pH (4.96–5.13) is comparable to hot brew (4.85–5.10). For low acid concentrate, use Puroast Low Acid Coffee, verified at pH 5.74–5.82.
Dilute 1:1 with water or milk for a standard-strength drink. For a stronger cup, use 2 parts concentrate to 1 part water. For lattes, dilute with oat milk, almond milk, or dairy milk to taste.
Significantly. A 32oz bottle of Starbucks Cold Brew Concentrate costs around $10. A standard batch of homemade concentrate using a 2.5lb bag of Puroast costs approximately $1.50–$2.00 per 32oz equivalent — and delivers verified low acid and 5X more antioxidants.
Yes, but the acidity of your concentrate is entirely determined by the coffee you use. Standard commercial coffees sit at pH ~5.0 regardless of concentration. Puroast Low Acid Coffee — verified at pH 5.74–5.82 — is the only option that produces genuinely low acid concentrate, because the acid reduction happens during roasting, not brewing.
The Only Concentrate That's Actually Low Acid
LACCSA Certified · UC Davis Studied · pH 5.74–5.82 · 5X More Antioxidants
Shop Puroast Low-Acid CoffeeSources: Rao & Fuller — Scientific Reports 2018 | Ibrahim et al. — NC A&T 2024 | Sulaiman, Moon & Shibamoto — JDS 2011
Puroast does not provide medical advice, diagnosis, or treatment. Always consult a qualified health professional with any questions or concerns about your physical health.
