Free cheat sheet
Water is most of every shot, and hard water is a common reason home machines need repair. Here is the short version: what to use, what to avoid, when to descale, and the four water products we link.
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| Your tap (hardness) | What to do |
|---|---|
| Low hardness (under about 50 ppm) | A pitcher or tank filter is enough. Descale per the manual. |
| Medium (about 50 to 150 ppm) | Use a tank filter and change it on schedule. Descale more often than the manual minimum. |
| Hard (over about 150 ppm) | Switch to distilled water plus an espresso mineral packet. Filters alone will not keep up. |
Ranges are rules of thumb, not a lab spec. Your machine manual wins if it says something different.
Four products: a mineral packet, two mixing tools, and a filter for plumbed machines.
| Pick | Product | Price | Buy |
|---|---|---|---|
| Mineral packet | Third Wave Water Espresso Profile, 12 count | $18.00 | Check price on Amazon |
| Mixing bottle | Lotus Coffee Water Mixing Bottle (450 ml) | $10.00 | Check price on Prima |
| Mineral drops | Lotus Coffee Water Sodium Bicarbonate | $12.50 | Check price on Prima |
| Plumbed filter | BWT Bestmax Premium water filter cartridge | $144.00 | Check price on Prima |
Third Wave Water covers the espresso mineral recipe. Lotus covers mixing. BWT is only for plumbed machines.
Mineral packet
Why we picked it
These espresso-profile sticks mix into a gallon of distilled or reverse-osmosis water. That gives you a repeatable recipe made for espresso machines, with less scale than hard tap water. Mix one stick per gallon and use that water in the tank.
$18.00
Amazon new-offer price, checked Nov 6, 2026.
Mixing bottle
Why we picked it
A 450 ml glass bottle for mixing mineral drops or packets into a smaller batch of distilled water before you fill the tank. Useful if you do not want to mix a full gallon at once.
$10.00
Prima Coffee price, checked Nov 6, 2026
Mineral drops
Why we picked it
Lotus sodium bicarbonate drops add buffer to distilled water. This is one part of a homemade water recipe, not a complete espresso profile on its own. Use it if you already mix your own minerals; for a ready-made espresso recipe, use the Third Wave Water packet above.
$12.50
Prima Coffee price, checked Nov 6, 2026
Plumbed machines
Why we picked it
A replaceable cartridge for plumbed espresso machines that take a BWT Bestmax head. It is not a drop-in filter for a Breville tank. If your machine fills from a reservoir, use mineral packets or a tank filter instead, such as the Claro filters on the Barista Express accessories page.
From $144.00
Prima Coffee price, checked Nov 6, 2026
If your tap is hard, mix distilled or reverse-osmosis water with an espresso mineral packet. If your tap is already soft, a tank or pitcher filter plus regular descaling is enough. Do not use empty distilled water or salt-softened water.
Medium Roast is mixed for filter coffee. The espresso profile is the packet we recommend for espresso machines.
No. BWT Bestmax is for plumbed machines. Tank machines should use mixed mineral water or a matching in-tank filter.
Amazon and Prima Coffee prices checked Nov 6, 2026. Prices change, and the store page wins at checkout.
Next: How to descale an espresso machine · Barista Express accessories · All free guides
