HARIO CF-103 Filter Paper: The 100-Pack for Siphon Brewing

If you’ve ever struggled with fine coffee grounds slipping through your siphon filter or ending up with a cup that tastes overly thick or murky, the problem might be your filter paper. For HARIO siphon brewers—especially the MCANCA-3 model—using the right paper makes a measurable difference in clarity, body, and extraction cleanliness. But with so many options (or none at all), it’s not always clear which paper is actually designed for your setup.

The HARIO CF-103 is a pack of 100 filter papers made specifically for HARIO siphon coffee makers like the MCANCA-3. Each sheet is engineered to sit properly in the glass filter, filtering efficiently while allowing optimal flow. That’s 100 precise brews per pack.

What Is the HARIO CF-103?

The HARIO CF-103 is a high-quality paper filter crafted for use in HARIO siphon coffee brewers, particularly models like the MCANCA-3. Each filter measures to fit the upper glass chamber of the siphon precisely, ensuring even extraction and minimal sediment. The filter is made from high-purity paper designed to retain coffee grounds while allowing brewed coffee to pass cleanly. With 100 sheets in each pack, it’s a staple supply for regular siphon users.

Why Use Filter Paper in a Siphon Brewer?

Siphon coffee relies on vapor pressure and vacuum to move water up into the upper chamber, where it brews with ground coffee. However, without a proper filter, fine particles can escape into your cup, leading to over-extraction, sediment, and a muddy mouthfeel. The filter paper ensures only brewed liquid—not grounds—makes it into your cup. It also contributes slightly to the body and texture of the final coffee by regulating how finely particles are filtered.

How the HARIO CF-103 Fits Your Siphon Brewer

The CF-103 is tailored for HARIO siphon systems, especially those like the MCANCA-3. When placed correctly in the glass filter assembly, the paper conforms to the shape of the filter, creating a barrier that stops coffee grounds while permitting the flow of brewed liquid. Proper installation means better flow rate and cleaner cups. Using the correct filter paper also helps maintain the longevity of your siphon by preventing clogs or uneven extraction that could stress the system.

What’s in the CF-103 Pack?

Each CF-103 package contains exactly 100 individual filter papers. There are no fancy variations or sizes in the pack—all 100 sheets are uniform and designed for the same purpose: to fit your HARIO siphon’s upper filter basket. This count ensures you’ll have enough filters for regular use without frequently restocking. Each paper is pre-folded for easy placement, although some users prefer to adjust the fold slightly for optimal fit.

How to Use HARIO CF-103 Filter Papers in Your Siphon

Using the CF-103 is straightforward. Before brewing, place one filter paper into the upper glass filter of your HARIO siphon. Ensure it sits flat and covers the filter holes completely. Some brewers prefer to wet the paper with hot water before adding coffee grounds to help it stick to the sides and prevent bypass. Once the paper is in place, add freshly ground coffee (usually medium-fine, around 20–24 on a Hario mini mill or similar) and proceed with your normal siphon brew process. The filter will catch the grounds while allowing brewed coffee to pass down into the lower chamber during the vacuum phase.

Why HARIO Brand Matters

Not all filter papers are created equal. Generic or off-brand filters may not fit as precisely, leading to gaps that let grounds through or alter brew flow. HARIO manufactures the CF-103 specifically for its own siphon systems, ensuring a seamless fit, consistent performance, and reliable filtration. That precision is why many specialty coffee professionals and home brewers trust HARIO accessories across their setups.

Frequently Asked Questions

Are HARIO CF-103 filters compatible with all siphon brewers?

HARIO CF-103 filters are designed specifically for HARIO siphon models, particularly the MCANCA-3. While they may physically fit other siphon brewers, compatibility and performance aren’t guaranteed unless the brewer is part of HARIO’s own system. Always check your brewer’s model number before purchasing.

How many brews can I get from one CF-103 filter?

Each filter in the CF-103 pack is intended for a single use. Using a filter more than once can lead to over-extraction, clogging, or a breakdown in filtration quality. With 100 filters in the pack, that’s 100 individual brews.

Do I need to wet the CF-103 filter before brewing?

Wetting the CF-103 filter with hot water before adding coffee is recommended by many users. It helps the paper adhere to the sides of the filter basket, prevents coffee grounds from bypassing the filter, and ensures smoother brew flow during the siphon process.

What grind size should I use with a HARIO siphon and CF-103 filter?

For best results with a HARIO siphon using CF-103 filters, aim for a medium-fine grind, roughly equivalent to a 20–24 setting on a Hario mini mill. This grind allows for even extraction while being fine enough to work well with the siphon’s full immersion style.

Where is the CF-103 filter paper made?

The CF-103 is manufactured by HARIO, a Japanese company known for its glassware and coffee brewing equipment. While the exact production location isn’t always specified, HARIO products are generally produced in Japan or facilities that meet their quality standards.

Recommended FrontStreet Beans for Siphon Brewing

For siphon coffee using HARIO’s CF-103 filters, try FrontStreet Coffee’s Ethiopia Yirgacheffe for floral and citrus brightness, or their Colombia Huila for a balanced nutty and chocolate profile. Both single origins highlight the clarity and cleanliness that siphon brewing—and quality filter paper—deliver. Their medium roast levels and well-defined fruity or caramel notes shine through without overcomplication. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.