The importance of water filtration in coffee

Water Filtration: Unlock the Full Potential of Your Coffee

At Rounton Coffee, we believe that every cup of coffee should be an experience. While selecting high-quality and proper tasty beans is crucial, there's another vital component that often goes unnoticed: water. Did you know that water makes up about 98% of your coffee? This means that the quality of your water has a significant impact on the flavour and overall experience, highlighting the importance of proper water filtration.

Why Water Quality Matters

Water is more than just a solvent that extracts the flavours from coffee grounds. The minerals and impurities present in your water can either enhance or detract from your coffee's taste. Here’s how:

Mineral content

The mineral content in your water plays a significant role in the flavour of your coffee. Minerals like calcium and magnesium are essential for extracting the coffee's complex flavours. These minerals interact with the coffee grounds during brewing, helping to release the aromatic compounds and oils that give coffee its distinct taste.
A balanced presence of calcium and magnesium can enhance the natural sweetness and brightness of your coffee, revealing its unique flavour profile. This balance ensures that your coffee is rich and well-rounded, allowing you to fully appreciate the flavours of different beans.
On the other hand, water with too high a mineral content can lead to over-extraction. This process can cause your coffee to taste bitter or metallic. Excess calcium can also contribute to scale buildup in your coffee maker, which can affect its performanc over time.

pH Levels

The pH level of water is a measure of its acidity or alkalinity. This factor is crucial in the coffee brewing process, as it affects the extraction of flavours from the coffee grounds.
The ideal pH level for brewing coffee is slightly acidic, around 6.5-7.5. Water in this range supports optimal extraction, allowing the coffee's nuanced flavours to come through without being overshadowed.
If the water is too acidic (a lower pH), it can lead to over-extraction, where too many acids are pulled from the coffee grounds. This can result in a sour, overly tangy cup of coffee, which no one wants.
On the other hand, water that is too alkaline (a higher pH) can cause under-extraction. In this case, the coffee may taste flat and dull, as not enough of the flavourful compounds are extracted from the grounds.


Impurities in water, such as chlorine, chloramine, and other chemicals, can significantly affect the taste of your coffee. These substances are often added to municipal water supplies to kill harmful bacteria, but they can have unintended consequences for your brew.

Chlorine is commonly used to treat tap water, but it can impart a harsh, chemical taste to your coffee. This can overshadow the delicate flavours of the coffee, leaving you with a less enjoyable cup.

Other impurities, including organic compounds from natural water sources or industrial pollutants, can introduce off-flavours. These compounds can create a musty or stale taste, detracting from the freshness and vibrancy of your coffee.

Using a water filtration system can effectively remove these impurities, ensuring that the water you use is pure and clean. This allows the true flavours of your coffee to shine through.

The Solution = Proper Water Filtration

To ensure that your water is just as high-quality as your coffee beans, we recommend using a water filtration system. Here are a few benefits of filtered water:

Improved Taste

When water is free from unwanted chemicals and contaminants, the natural characteristics of the coffee beans can come through more clearly. This means you'll experience the full spectrum of flavours that your coffee has to offer - from the bright acidity and fruity notes from our Ugandan and Rwandan coffee beans to the rich, chocolatey undertones you can experience from our Brazilian and Colombian beans.


Filtration provides consistent water quality, so every cup of coffee tastes just as good as the last. Consistency is key to achieving a reliable and repeatable coffee experience. When the water you use is always high quality, you can better control the brewing process and ensure that the flavours remain balanced and true. This is particularly important for coffee lovers who want to recreate the same great taste with every brew. Consistent water quality eliminates one of the variables that can cause fluctuations in taste, allowing you to perfect your brewing method and enjoy your coffee each time.

Longer Lifespan for Equipment

Using filtered water can prevent scale buildup in your coffee maker, extending its lifespan and maintaining its performance. Hard water, which contains high levels of calcium and magnesium, can lead to the formation of limescale deposits inside your coffee maker. These deposits can clog the machine's internal components, reducing its efficiency and potentially causing damage over time. By using filtered water, you minimise the risk of limescale buildup, ensuring that your coffee maker operates smoothly and efficiently. This not only helps to maintain the quality of your coffee but also saves you money on in the long run. A clean machine is essential for producing great-tasting coffee, and filtered water helps keep your equipment in top condition.

Tips for Filtering Your Water

Ensuring the quality of the water you use for brewing coffee is essential for unlocking the full potential of your coffee beans. Here are some effective methods to filter your water and enhance your coffee experience:

Use a Water Filter Pitcher

Water filter pitchers are a convenient and effective solution for daily use. These pitchers are designed with built-in filters that remove impurities from tap water. Water filter pitchers are easy to use and require minimal setup. Simply fill the pitcher with tap water and let it pass through the filter. The filtered water is then stored in the pitcher, ready for use. These pitchers are generally affordable and widely available, making them an accessible option for most households. Replacement filters are also reasonably priced and easy to find.

Invest in a Home Filtration System

For the best results, consider investing in a more advanced home filtration system. Install these systems under your sink or connect them directly to your water line for a higher level of filtration and convenience.

Home filtration systems use multi-stage filters to remove a broader range of impurities, including sediments, chlorine, heavy metals, bacteria, and even some chemicals. This ensures that your water is of the highest quality. Unlike water filter pitchers, home filtration systems provide a continuous supply of filtered water, eliminating the need to refill and wait for the filtration process. This is particularly beneficial for households that consume large quantities of water.

While the initial investment for a home filtration system is higher, it can save you money in the long run by reducing the need for bottled water and frequent replacement of pitcher filters. Additionally, these systems typically require less frequent maintenance.

Check Your Water Quality

Understanding your water's quality is crucial for selecting the right filtration method. If you're unsure about your water's quality, you can purchase a testing kit to measure its mineral content, pH levels, and presence of contaminants. These kits are available to purchase online and on the high street and are easy to use. They typically include test strips or digital meters that provide readings on various parameters such as hardness, pH, chlorine levels, and more.

By knowing your water's specific characteristics, you can tailor your filtration approach to address the particular issues present in your water supply. For example, if your water is high in chlorine but low in minerals, you might focus on filters that are particularly effective at chlorine removal.

At Rounton Coffee, we are passionate about every step of the coffee-making process. By paying attention to the water you use, you can unlock the full flavour profile of our beans and enjoy a fantastic cup of coffee each time.

Happy brewing!