You can dial in the perfect grind, nail the 16g dose, and still pull a shot that tastes off. The culprit hides in plain sight: the water. Espresso is about 95% water, which makes water the biggest ingredient you never think about. Fixing your water for espresso takes less effort than dialing in a new bean.
Tip 1: Aim for the 75–250 ppm TDS sweet spot
TDS — total dissolved solids — is the mineral load in your water, measured in parts per million. The Specialty Coffee Association suggests 75–250 ppm for espresso. Below that, water under-extracts and shots taste sour and thin; above it, you get heavy, bitter cups. Minerals are not the enemy: magnesium pulls brighter, fruitier notes, calcium adds body, and a little bicarbonate keeps acidity in balance. A $15 TDS pen tells you where your tap water lands — the single cheapest diagnostic tool after a scale. If you are already tuning your grind for the NEO Pro's 16g basket, water is the next variable worth locking down.
Tip 2: Filter out chlorine before anything else
Whatever your mineral level, chlorine has to go. Chlorine and chloramine give a chemical, pool-like edge to the cup and they are not kind to equipment either. A basic carbon filter pitcher handles it. This is step zero because it fixes the worst-tasting water fault in one move — do this before you start obsessing over mineral recipes.
Tip 3: Don't use distilled or zero-mineral water
Pure water sounds premium but brews dull. With nothing to work with, it under-extracts the puck and you get a sour, hollow shot no grind change will fix. Distilled is also more corrosive to metal parts over time. You want some minerals — just not too many. A decent spring water with moderate mineral content, or your filtered tap if it sits in the TDS range, beats a fancy empty bottle every time.
Tip 4: Hard tap water is a machine problem too
Very hard water does double damage: bitter, muted cups and scale inside the 120W boiler. Scale acts like insulation, making heating slower and less even — and your descaling chores get harder. If your TDS meter reads high, switch to a filtered or balanced bottled water for brewing, and follow the descaling routine for the NEO Pro on schedule. Preventing scale beats dissolving it.
The portable angle is your advantage: the NEO Pro's 70ml tank means fresh water per shot, not per week. Pick a house water you trust and stick with it. More depth on mineral recipes is covered well in this espresso water quality guide.
FAQ
Can I just use my fridge filter? Usually yes — fridge and pitcher carbon filters remove chlorine and take the edge off hardness. Test the result with a TDS pen; if it lands in the 75–250 ppm band, you are set.
Does water temperature matter as much? It matters more for taste balance, but the NEO Pro handles it: Heated 5-Stage Brew brings water to 92°C on its own, so your job is just choosing what goes in the tank.
My shots taste sour even with good beans — is it the water? It could be: very soft water under-extracts. But check the flavor diagnosis chart first — sour usually means underextracted, and heat is the first suspect.
Spend ten minutes on water once, and every shot after gets better. The machine holds the true 6–9 bar at the puck; you handle the water and the beans.
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