We recommend you read the following Q&A
about our products first,
and if your questions still hove not been answered,
please contact us.

GOLD FILTER C246BK/286BK
B FLASK GRANDE - C520BK -
GOLD FILTER DOUBLE WALL MUG - C412 -
SINGLE CUP GOLD FILTER C211 Series
PORCELAIN CANISTER C820BK

GOLD FILTER C246BK/286BK

Extraction is too fast
Vertical-shape mesh allows hot water to flow faster than other filters. Please adjust the amount of hot water to achieve the desired taste.
The filter doesn’t fit my coffee machine or brewer.
There may be some coffee machines and brewers in which this filter does not fit as it has a unique shape.
Why are there coffee grounds in the cup?
Vertical-shape mesh is big enough for coffee grounds to be extracted through it but it doesn’t affect the quality of coffee.
I can see oil floating
While paper filters absorb coffee oil, the gold filter allows coffee oil to be extracted as well. This is why there is coffee oil floating on the surface of coffee in a cup; therefore, taste and aroma are different.

B FLASK GRANDE - C520BK -

When drink inside is lukewarm
It is recommended to pre-heat (pre-cool) the flask with hot (cold) water for about one minute for a better thermal effect.
When rust has developed inside the flask
Since inside of the flask is stainless steel, salty drinks such as miso soup may cause rust to develop.
When there is a leakage
Please make sure to keep the volume of drink under the “MAX” sign, otherwise the drink may leak.
When the color of tea changed
The color of hot tea may change when keeping it inside for a long period but there is no risk to health.

GOLD FILTER DOUBLE WALL MUG - C412 -

Can I put it in a microwave?
This product is not microwave proof.
Can I use a bleaching agent?
It is possible to use for the double wall mug. However, when used on the gold filter, it is possible for damage to occur on the black plastic section. Please read the notes on the bleaching agent’s bottle and use as directed.

SINGLE CUP GOLD FILTER C211 Series

Extraction is too fast.
Please read “How to brew a cup of coffee by using Cores Gold Filter” in the section of “Cores Gold Filter C245・C285”.
How much coffee or hot water should I use?
Please read the user manual or the section shown below to learn the amount of coffee and hot water required. Product information for “Cores Gold Filter C240・C280
I can see oil floating.
While paper filters absorb coffee oil, the gold filter allows coffee oil to be extracted as well. This is why there is coffee oil floating on the surface of coffee in a cup. It is important for enjoying unique characteristics and flavor of coffee to directly extract coffee oil.
Extracted coffee tastes weak.
Vertical-shape mesh allows hot water to flow through quickly. Please read “How to brew a cup of coffee by using Cores Gold Filter” in the section of “Cores Gold Filter C245・C285”.
Why are there coffee grounds in the cup?
In comparison to other filters (e.g. paper filter), vertical-shape mesh is big enough for coffee grounds to be extracted through it.You may choose not to consume the drink in its entirely, instead leaving the coffee grounds in the bottom of the cup.
What is the appropriate diameter of a cup to be used for this filter?
We recommend you use a cup with 7 to 9.5 cm in diameter.
Can I wash in a dish washer (or use a dish dryer) ?
Yes.
Can I brew English tea and Japanese tea with this product?
Since this product is designed for brewing coffee, it is not suitable for brewing tea.
Why does the recommended amount of ground coffee change, based on the roasting degree instead of grind size?
Moisture content varies depending on the roasting degree and this affects on the extraction ratio. We recommend the size of the ground coffee to be medium, or a bit coarser.

PORCELAIN CANISTER C820BK

Can I wash in a dish washer (or use a dish dryer) ?
Yes.