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pH Testing¶

Tags: #coffee/brewing #coffee/brewing/water Aliases: Testing water pH, pH measurement methods, How to test pH Related: Water in Coffee MOC | pH | pH Meters | pH in Coffee Water | DIY Testing Status: ✅ Complete

Overview¶

Testing the pH of brewing water verifies that it falls within the SCA-recommended range of 6.5–7.5 and helps diagnose water quality issues. Three methods are available — electronic pH meters, pH test strips, and indicator solutions — with varying degrees of accuracy, cost, and convenience. For coffee water management, electronic pH meters are the standard instrument; test strips are adequate for rough screening but insufficient for precise water assessment or troubleshooting.

Testing Methods¶

Electronic pH Meters¶

The most accurate and reliable method. A calibrated pH meter with a glass electrode and automatic temperature compensation (ATC) provides pH readings to ±0.01–0.1 pH depending on meter grade. See pH Meters for instrument types, calibration procedures, and electrode maintenance.

Recommended for: Café water management, water recipe development, diagnosing water quality problems, verifying treated or blended water.

pH Test Strips¶

Paper or plastic strips impregnated with pH-sensitive indicator dyes. The strip is dipped in the water sample, colour develops, and is matched against a printed reference card.

Accuracy: ±0.5–1.0 pH units
Cost: Very low (< AUD$20 for 100+ strips)
Limitations: Colour matching is subjective and affected by turbidity or coloured solutions; wide pH indicator strips are less precise than narrow-range strips; temperature sensitivity; not suitable for accurate diagnostic work
Suitable for: Rough screening to confirm water is approximately neutral; checking RO permeate for gross pH problems; field use where no meter is available

Narrow-range strips (e.g., pH 6.0–8.0 in 0.2 increments) are more useful for coffee water than broad-range strips (pH 1–14).

Indicator Solutions (Liquid Indicators)¶

Drops of pH indicator solution added to a water sample; colour is compared to a reference chart. Examples include phenol red (pH 6.8–8.4) and bromothymol blue (pH 6.0–7.6).

Accuracy: ±0.2–0.5 pH units in the relevant range
Suitable for: Swimming pool testing kits, occasionally repurposed for rough water assessment

Testing Procedure (pH Meter)¶

Calibrate the meter with buffer solutions (pH 4.0 and 7.0 minimum) at the start of each session
Rinse the electrode with distilled water, blot dry
Submerge the electrode in the water sample (minimum depth per manufacturer specification)
Wait for the reading to stabilise (typically 30 seconds to 2 minutes)
Record the reading with temperature if meter does not auto-compensate
Rinse electrode with distilled water, return to storage solution

What to Measure¶

For coffee water management, pH is one component of a full assessment: - pH alone is insufficient — alkalinity (KH) measurement is equally or more important - Measure pH alongside alkalinity (titration kit), hardness (GH test), and TDS (EC meter) - A complete water profile enables accurate diagnosis and recipe decisions — see Water Standards and Ideal Water for Coffee

Interpreting Results¶

pH result	Interpretation
6.5–7.5	SCA acceptable range; pH is not the primary concern
Below 6.5	Acidic water; check for low mineral content or dissolved CO₂; may indicate soft, aggressive water
7.5–8.0	Slightly elevated; likely correlated with moderate alkalinity — measure KH
Above 8.0	High alkalinity; KH is almost certainly problematic; water treatment likely required

Key Facts¶

SCA target pH for brewing water: 7.0 (acceptable range 6.5–7.5)
Electronic pH meters with ATC are the standard measurement tool; accuracy ±0.01–0.1 pH depending on grade
Test strips provide ±0.5–1.0 pH accuracy; adequate for screening, not for diagnostic work
pH measurement should always be paired with alkalinity and hardness testing for a complete water picture
Calibration with certified buffer solutions is required before each measurement session

pH
pH Meters
pH Scale
pH in Coffee Water
DIY Testing
Measurement Tools
Water in Coffee MOC

References¶

Changelog¶

Date	Change
2026-04-28	Note created

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