Both effectively reduce water hardness. BWT enriches the water with magnesium, which tends to positively influence the taste. Brita filters more neutrally. For ambitious coffee preparation, under-sink filters or mineral blends are the better solution.

Brita or BWT: Which water filter is better for coffee?

Both effectively reduce water hardness. BWT enriches the water with magnesium, which tends to positively influence the taste. Brita filters more neutrally. For ambitious coffee preparation, under-sink filters or mineral blends are the better solution.

Why that is the case

Brita and BWT are the two dominant table water filter brands in Germany. Both use ion exchange cartridges that remove calcium and magnesium from the water, thus reducing the hardness. For coffee, this is fundamentally positive — less limescale, more aroma, less machine calcification.

Brita (Classic/Maxtra Pro) removes calcium and magnesium and exchanges them for sodium. The result is soft, neutral-tasting water. The carbonate hardness decreases, and the pH value shifts slightly towards the acidic side (around 6.5–6.8). Chlorine and taste-impairing substances are removed by activated carbon.

BWT (Magnesium Mineralized Water) goes a step further: the cartridge removes calcium and simultaneously enriches the water with magnesium. The idea behind this: magnesium ions extract coffee aromas particularly well — this is supported by studies. The water tastes slightly rounder and fuller. The pH value is similar to that of Brita.

In practice, the difference between the two filters is subtle for most home users. Both are a significant improvement over unfiltered, hard tap water. BWT has a slight advantage for coffee due to the magnesium enrichment, but the difference only becomes noticeable with high-quality beans and attentive tasting.

Both filters have a limitation: they cannot precisely adjust the water hardness to a target value. The result depends on the input hardness and fluctuates over the lifespan of the cartridge. At the beginning, it filters more strongly, towards the end less so.

If you need precise control, you can turn to alternatives: Under-sink filters (BWT Bestprotect, Everpure) deliver more consistent results and are connected directly to the water line. Mineral blends (Third Wave Water) with distilled water allow for an exact brewing water profile — more complex, but the best solution for serious coffee enthusiasts.

In practice at Green Wall Coffee

At Sophienstraße 27, we use a modern BWT reverse osmosis system. This gives us full control over our water, and we aim for an average mineralization of 120 ppm — perfect for our roasts. For guests who want to get started at home, I recommend BWT as a table filter — the magnesium enrichment makes sense flavor-wise. But honestly: whether Brita or BWT, both are a hundred times better than no filter at all given Berlin’s water hardness.

Related Questions

• Do I need a water filter for my coffee machine?
• Which water hardness is ideal for coffee?
• Should I use distilled water for coffee?

More depth on this topic can be found in our article How to Make Perfect Espresso. Or stop by at Sophienstraße 27 — Mon–Fri 8am–5pm, Sat 10am–5pm.