How to Clean and Prime a Fountain Pen Converter

What Is a Fountain Pen Converter?

A converter is a small, refillable ink reservoir that replaces disposable cartridges in a fountain pen. Instead of buying pre-filled cartridges, a converter lets you draw ink directly from a bottle — opening up hundreds of ink colours and saving money in the long run.

Most converters use either a piston mechanism (a screw or push-button that draws ink up) or a squeeze mechanism (a rubber sac you compress and release). Both work well, but they require slightly different filling techniques.

Keeping your converter clean is essential for consistent ink flow and pen longevity. Here's everything you need to know.

When Should You Clean Your Converter?

• When switching to a different ink colour
• When the pen has been sitting unused for more than 4–6 weeks
• When ink flow becomes inconsistent or the pen skips
• When you notice ink residue or discolouration inside the converter
• As part of regular maintenance every 1–2 months

What You'll Need

• Your fountain pen with converter
• A cup or bowl of room-temperature water
• A bulb syringe (optional but helpful)
• Paper towels or a soft cloth
• A pen flush solution (optional, for stubborn ink)

Step-by-Step: How to Clean a Piston Converter

Step 1: Remove the Converter from the Pen

Unscrew or pull the converter out of the pen's grip section. Set the nib and grip section aside — you'll clean those separately.

Step 2: Expel Remaining Ink

Hold the converter over a sink or paper towel and turn the piston knob to push any remaining ink out. Don't waste good ink — if the ink is clean and uncontaminated, you can push it back into the bottle.

Step 3: Draw in Water

Submerge the converter's opening in a cup of room-temperature water and turn the piston to draw water in. Fill it completely.

Step 4: Expel the Water

Hold the converter over a sink and expel the water by turning the piston in the opposite direction. The water will come out tinted with ink — this is normal.

Step 5: Repeat Until Clear

Repeat steps 3 and 4 until the expelled water runs completely clear. This may take 3–5 cycles depending on the ink. Darker or more saturated inks (like red or green) may take more cycles.

Step 6: Dry the Converter

Once clean, expel as much water as possible and leave the converter to air dry for a few hours before refilling. You can also gently shake it or use a bulb syringe to blow out remaining water.

Step-by-Step: How to Clean a Squeeze Converter

Squeeze converters work on the same principle but use a different mechanism. Squeeze the sac to expel air, submerge in water, release to draw water in, then squeeze again to expel. Repeat until the water runs clear.

How to Prime a Converter (Fill It with Ink)

Once your converter is clean and dry, here's how to fill it properly:

1. Reattach the converter to the pen's grip section.
2. Submerge the nib and grip section into your ink bottle, ensuring the nib is fully covered.
3. Turn the piston knob (or squeeze and release) to draw ink into the converter.
4. Expel a small amount of ink back into the bottle to remove any air bubbles.
5. Draw ink in again to fill the converter completely.
6. Wipe the nib and grip section clean with a paper towel.
7. Cap the pen and let it sit nib-down for a few minutes to allow ink to flow into the feed.

Troubleshooting: Ink Won't Flow After Filling

If your pen doesn't write immediately after filling, try these steps:

• Prime the feed: Hold the pen nib-down and gently press the nib against a paper towel to encourage ink flow.
• Check for air bubbles: Expel a small amount of ink and refill to remove trapped air.
• Flush and retry: If the pen still won't write, flush the nib and feed with water, dry, and refill.
• Check the converter seal: Make sure the converter is fully seated in the grip section with no gaps.

Caring for Your Converter Long-Term

Converters are durable but not indestructible. Avoid using very thick or heavily pigmented inks (like some shimmer inks) in converters without regular cleaning, as particles can clog the mechanism. Store converters empty if you're not using them for extended periods.

Most converters last for years with proper care. If the piston mechanism becomes stiff, a tiny drop of silicone grease (available at pen shops) can restore smooth operation.

Shop Converters and Accessories at Al Qalam

We stock a range of converters compatible with popular pen brands, as well as pen flush solutions and cleaning accessories. Browse our accessories collection or visit our ink collection to find the perfect ink for your next fill.