Espresso Water Chemistry & Recipe Calculator

Dial in mineral additions for RO or distilled water — pick a published recipe or set your own GH/KH targets, and get exact gram weights plus a limescale risk read.

Recipe Preset

RPavlis Water (Zero Scale) Potassium bicarbonate only. Zero general hardness, mild alkalinity to tame acidity. Barista Hustle Recipe 6 Epsom salt for hardness, baking soda for alkalinity. SCA Standard Water Specialty Coffee Association reference target. Custom PPM Recipe Set your own general hardness and alkalinity targets.

Alkalinity Source (KH)

Water Volume

Addition Method

Your Recipe

Baking Soda

0.00 g

Epsom Salt (MgSO₄·7H₂O)

0.00 g

Add both amounts directly to 3.79 L of RO or distilled water and stir until fully dissolved.

Recipe Comparison

Recipe	GH	KH	Scale Risk
RPavlis (Zero Scale)	0 ppm	50 ppm	Low
Barista Hustle Recipe 6	80 ppm	40 ppm	Low
SCA Standard	68 ppm	40 ppm	Low
Peak Water (adjustable filter)	~68 ppm	~40 ppm	Low

Peak Water is a bypass-dial filter, not a fixed recipe — figures shown are its commonly used mid-range setting, not a manufacturer spec.

Recommended Equipment

0.01g Precision Scale For weighing small mineral doses accurately.

Food-Grade Epsom Salt USP-grade magnesium sulfate for general hardness.

Potassium Bicarbonate Food-grade KHCO₃ for alkalinity without added sodium.

Descaling Powder Citric-acid-based descaler for machines already carrying scale.