COFIL Flow Ceramic Coffee Filter

The ceramic coffee filters are designed for hand-rinse only. Dishwasher detergent soaks into the pores and taints your coffee, and the heat and knocking around can chip or crack the ceramic.

We do not recommend it to put Imari Toei's COFIL coffee filters in the microwave, since the thermal shock can cause cracks or even breakage.

No, all COFIL coffee filters are a 2-in-1 zero-waste paperless filter and dripper. They are made with countless 50-micron holes, about the width of a strand of hair, that let the coffee through while holding the grounds back. Add the grounds and just pour. You can reuse it as many times as you like.

Use coarse to medium, the kind used for drip or pour-over. A fine, espresso-style grind sits on top and clogs the holes, so the coffee slows to a crawl. If yours is dripping slowly, the grind might be the reason why, so just go a little coarser so it flows freely again.

It can be used to brew tea as well. However, if you will switch between drinks that can leave traces in the pores that carry over to your next drink, we recommend a conscious hand-rinse or wash to avoid mixing flavors.

The COFIL filters rest on the rim of a cup, mug, or server with an opening of roughly 6.9–11.3 cm (2.7–4.4 in). Measure across the inside of your favorite mug to before using them. Very wide bowls or narrow espresso cups won't sit securely.

Over time, coffee oils build up inside the pores and slow things down. To bring it back to use:

1. Put the filter in a pot of water with no coffee or soap.
2. Bring it to a boil and let it simmer for 5–10 minutes. A spoonful of baking soda helps lift any stubborn oil.
3. Take it out with tongs due to the heat and let it dry completely.

This is normal upkeep and we recommend to do it every few weeks to a couple of months, depending on how often you brew.

Each filter is made by hand in Hasami, Nagasaki, so small differences in color, texture, spots, and shape are completely normal and do not change how the coffee brews.

All prices include FREE international shipping. Please allow up to 5 weeks for shipping, depending on your country of residence. Please see our Shipping Policy for details.

Please note: Our products ship directly from Japan to you. You may be required to pay customs duties and/or customs clearance fees upon delivery (if applicable in your country).

FOR U.S. CUSTOMERS: As of May 8, 2026, all U.S. orders are shipped DDP (Delivered Duties Paid). Customs duties and import taxes are included for US customers in the final price shown at checkout.