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Cores FAQ

Q&ACores FAQ

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

  • GOLD FILTER DOUBLE WALL MUG – C402 – Q&A
    Can I use a bleaching agent?
    You are able to use a bleaching agent on the glass mug. When used on the gold coffee filter, the black resin section may be degraded. We strongly recommend you to follow the instructions of the bleaching agent you are using.
    Can I put it in a microwave?
    Only the glass mug is microwave proof therefore, please make sure to remove the lid and gold coffee filter.

    Can I wash in a dish washer?
    No, this product is not dish washer safe.

  • SINGLE CUP GOLD FILTER – C210 – Q&A
    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.
    Can I brew English tea and Japanese tea with this product?
    Since tea leaves need to move freely when extracted, this product is not suitable for brewing teas.
    Can I wash in a dish washer?
    No, this product is not dish washer/dish dryer safe.
    What is the appropriate diameter of a cup to be used for this filter?/div>

    We recommend you use a cup with 7 to 9.5 cm in diameter.
    I am uncomfortable with having coffee grounds in a cup.
    As Cores Gold Filter is designed to extract coffee oil, there will be a small amount of ground coffee in the cup. You may choose not to drink entirely and leave the ground coffee on the bottom of the cup.
  • HAND MADE GLASS SEVER – C504 / C506 – Q&A
    What is the benefit of the round shape?
    The round shape of the server helps prevent coffee grounds going into a cup when coffee is poured slowly, as the grounds will stay at the bottom of the server. It will be most effective when the coffee was extracted through a Cores Gold Filter.
    Can I wash in a dish washer or put in a microwave?
    Apart from the wooden lid, this product is microwave/dishwasher proof.
    Is it safe to pour with the lid on?
    Please remove the lid when pouring. There is a risk of getting burned as it can come off when the server is tilted.
    Are the parts sold separately?
    No, we don’t sell the parts separately.
    How can I wash the lid?
    Use a soft sponge and clean carefully, then wipe the water off to dry well. Avoid soaking in water for a long period as it can cause deformation and breakage.
    How big are the servers?
    Recommended maximum volume for C504 and C506 are 500ml and 750ml respectively.
  • POUR OVER STAND – C501 – Q&A
    Can I use a screwdriver to unscrew?
    Please do not use a screwdriver as these screws are designed to fit hex keys. Using screwdrivers can damage the head of the screws.
    How should I maintain?
    Since this product is made from a natural material, avoid soaking in water for a long period as it can cause deformation and breakage. Use a damp cloth to wipe off.
    The stand is wobbly.
    The screws may be loose. Please try tightening them.
  • GOLD FILTER – C240 / C280 – Q&A
    Extracted coffee tastes weak.
    Vertical-shape mesh allows hot water to flow smoothly. In the case ground coffee size is too coarse or excessive volume of hot water is used, please read “How to brew a cup of coffee by using Cores Gold Filter” in the section of“Cores Gold Filter C240・C280”.
    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.
    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.
    I can’t make coffee tasting good
    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”
    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”
    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 C240・C280”.
    Can I wash in a dish washer (or use a dish dryer)?
    No, as plastic is used for C240 and C280, they are not dish washer/dish dryer safe. You may clean with a small amount of detergent on a soft sponge.
  • CONE GOLD FILTER – C275GD/ C270SS – Q&A
    Extracted coffee tastes weak.
    Vertical-shape mesh allows hot water to flow smoothly. In the case ground coffee size is too coarse or excessive volume of hot water is used, please read “How to brew a cup of coffee by using Cores Cone Filter” in the section of“Cores Cone Filter C275・C270”.
    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.
    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.
    I can’t make coffee tasting good
    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”
    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 Cone Filter C275・C270”
    Extraction is too fast
    Please read “How to brew a cup of coffee by using Cores Gold Filter” in the section of “Cores Cone Filter C275・C270”.
    Can I wash in a dish washer (or use a dish dryer)?
    Yes. You may also clean with a small amount of detergent on a soft sponge.