Learn how to clean your water filter
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Taking Care of Your Clay Water Filter
Many people don’t know that Brazil’s famous clay water filter — despite being recognized worldwide for its efficiency — needs regular cleaning to keep working perfectly.
Just like seasoning a new piece of cookware, cleaning your clay filter is essential for ensuring it stays safe and effective. But how can you do this properly, without damaging the material or compromising the water quality?
That’s exactly what this post is about. In this guide, we’ll show you the step-by-step process of cleaning your clay water filter, inside and out, and help you understand how to keep it in top condition. Let’s dive in.
What Is a Clay Water Filter?
A clay water filter is a non-electric water purification system made of porous ceramic. Its body, usually crafted from natural clay, cools the water through heat exchange with the environment, keeping it naturally fresh.
The filter typically consists of two chambers: the upper part where you pour the water and the lower part where the filtered water collects. Between them is a ceramic filter candle that removes impurities from the water with surprising efficiency.
This small device can filter out substances like chlorine, heavy metals (like lead and aluminum), pesticides, and other particles — no electricity required.
In fact, a study cited in The Drinking Water Book describes the Brazilian clay water filter as the most effective household water purification system in the world.
Why Regular Cleaning Matters
Even though it may look clean on the outside, a clay filter gradually accumulates particles and microorganisms inside. That’s why it’s recommended to clean your filter every two weeks.
Keeping your filter clean helps maintain the efficiency of the ceramic candle, which is responsible for purifying the water. Over time, lack of maintenance can reduce the water flow or even allow contaminants to pass through.
Another important point: the ceramic filter candle should be replaced every six months or sooner if you notice discoloration or reduced water flow.
How to Clean a Clay Water Filter: Step-by-Step
Let’s walk through how to clean your clay filter without harming its natural structure or leaving any residues behind.
Cleaning the Inside
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Start by washing your hands thoroughly. This prevents introducing new contaminants during the cleaning process.
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Disassemble the filter carefully. Remove the upper tank, lower tank, and the ceramic candle.
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Use a soft, unused sponge. Dampen the sponge with clean water and gently wipe the inner surfaces. Avoid the abrasive side — it can damage the porous material.
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Rinse with plenty of water. Make sure to remove all residues from the cleaning process.
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Let it air dry. Once dry, reassemble your filter and it’s ready to use again.
Important: Never use soap, vinegar, bleach, or any household cleaning product. These can leave residues in the pores of the ceramic and affect both the taste and safety of your water.
Cleaning the Outside
The exterior of the clay filter can be cleaned more frequently — even daily, if you prefer.
Use a damp cloth or a soft sponge with clean water. Again, avoid cleaning products. The porous surface can absorb chemicals and pass them into the water over time.
Cleaning the Filter Candle
If water starts flowing more slowly, it’s a sign that the ceramic candle is clogged and needs cleaning.
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Use a soft brush or a clean sponge and water only.
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Gently scrub the candle in circular motions.
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Rinse thoroughly.
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Let it dry before reassembling.
If cleaning doesn’t restore the flow, or if the candle shows yellow stains, it’s time to replace it.
What About Those White Spots? It’s Not Mold!
You may notice white marks forming on the outer surface of your clay filter over time. They look like mold, but they’re actually not.
This phenomenon is called efflorescence and is caused by the evaporation of water through the clay’s natural pores. As the water evaporates, it leaves behind mineral salts — which appear as white or grayish stains.
The good news? Efflorescence is harmless. It doesn’t affect the quality of the water inside the filter.
If you prefer to remove these marks for aesthetic reasons, just wipe the exterior with a damp cloth or sponge — again, without chemicals.
Final Thoughts
Clay water filters are a low-tech yet highly efficient way to enjoy clean, fresh drinking water. Their natural cooling and filtration abilities make them a smart choice — especially in hot climates.
But like any tool in your home, they require care and maintenance. A few minutes of attention every couple of weeks can go a long way in preserving the filter’s performance and extending its lifespan.
Now that you know how to take care of your clay water filter, enjoy the peace of mind that comes with every refreshing glass!