Frequently asked questions

Smooth copper has an even, calm surface with a clear, mirror-like shine. Hammered copper is worked by hand into a pattern of small facets, so it catches the light differently and the surface gets a livelier, handcrafted character. The material and quality are identical for both finishes; it's purely a matter of taste.

More on this: smooth or hammered, what it changes day to day

Nine hundred millilitres is the usual size for a day: enough for a morning portion with a second glass after it, and it still fits in a bag. If you mostly drink at home, the 1.4 litre carafe is handier, because you pour for everyone at once. If you only want the morning ritual, the 300 millilitre cup is the simplest form.

More on this: which size suits your day and what to look for when comparing copper bottles

That depends on the ritual you want to give copper a place in. For everyday drinking, the water bottle, cup, mug and jug are a good fit; for wearing and self-care, the bracelet and tongue scraper; for energy and harmonisation, the pyramid and the tensor ring; and for the garden, the electroculture rods. Use our guide on the shop page if you're unsure, or browse the full range.

More on this: copper or stainless steel for a tongue scraper

Three things, and we would rather name them up front. You wash a copper bottle by hand, not in the dishwasher. It takes on its own patina over the months, precisely because there is no coating over it to prevent that. And still water is what goes in: lemon water, anything carbonated and sports drinks are acidic enough to dissolve copper faster. That is exactly the difference from a coated bottle: here you drink from the solid metal itself, and with normal use that lasts for years.

More on this: what a copper bottle gives you

Because different things are sold under the same name. The metal itself is a real cost: a 900 ml bottle is 300 grams of solid copper, and copper passed 12,000 dollars a tonne for the first time in December 2025. On top of that comes what you cannot see in a photo: a measured composition, a food safety test under the European rules, no lacquer layer on the inside, a bottle made in one piece with no seam or solder, and whatever else is in the box. In our case two independent laboratories did those measurements, and you can read them.

More on this: why one copper bottle costs 30 euros and another 60 and why copper got more expensive

Yes. There is a Kopero card with a QR code in the box. Scan it and you land on the digital manual for that exact product: use, care and what to watch out for. That way you do not have to keep a piece of paper, and we can update the manual when something changes.

Water that has stood overnight in copper is called tamra jal in Ayurveda and has been drunk for thousands of years. Copper itself is an essential trace element your body works with every day, and Europe recognises eight official health claims for it, among them a contribution to normal energy metabolism and to the protection of cells from oxidative stress. Alongside that there is research into what copper does to water quality. We have set out what has been shown and by whom, so you can see for yourself what it rests on.

More on this: is copper water healthy? and the eight recognised EU claims for copper

The Ayurvedic habit is one portion a day: fill it in the evening, let it stand overnight and drink it in the morning. More is not better, because copper is a trace element and you need very little of it. If you take medication or are unsure for another reason, ask your doctor.

More on this: how often to drink from a copper bottle and how the ritual fits an ordinary week

That is what the mug is for: copper conducts heat quickly, and the handle means you can still pick it up. Stick to black coffee and ordinary tea, and drink it rather than leaving it standing for hours. Lemon tea, very acidic fruit teas and soft drinks are better poured into glass, because acid dissolves copper faster.

More on this: coffee and tea from a copper mug

Rinse your product with water after use and dry it right away; copper looks its best when it isn't left damp for long. That sounds at odds with a bottle that holds water overnight, and it isn't: the water inside belongs there and is a matter of hours, while moisture left behind is a matter of days and has nowhere to dry to. Want to keep the shine? Polish it occasionally with a copper polish or a mix of lemon and salt (not too hard: salt is mildly abrasive and dissolves well in the lemon juice). Want it to last longer? A hair-thin layer of wax afterwards keeps the air off the metal and stretches the shine from days to weeks. Prefer to let a natural patina develop? Then there's nothing to do: that's part of real, uncoated copper. Every product comes with a Kopero card carrying a QR code; scan it and you get the digital manual for that exact product.

More on this: caring for a copper bottle, how to keep copper shiny and 8 mistakes with a copper bottle

Wash the product by hand with water and dry it well right away; the dishwasher isn't suitable for solid copper. For drinkware: always rinse thoroughly with water after use. To remove stubborn buildup, fingerprints or a dull shine, rub the copper with a slice of lemon and some salt or use a copper polish, then rinse and dry well afterwards. Every product comes with a Kopero card carrying a QR code; scan it and you get the digital manual for that exact product. In a bottle, a slice of lemon does not reach the wall: put lemon juice with a tablespoon of salt in there, screw the cap on and give it a shake.

More on this: baking soda, vinegar or lemon: what works and what damages

Yes, and that's normal. Uncoated copper reacts to air, water and touch, developing a brown to dark surface patina. That's not a defect but a sign of real, solid copper. Want the original shine back? Simply polish it up; leave the patina alone and it will deepen naturally over time.

More on this: why copper turns green or black

Yes, and you can keep drinking from it. New copper forms a thin oxide layer as soon as water stands in it, and in a new bottle that often starts out patchy, sometimes after a single night. With use, the colour usually evens out. At the bottom you will see a few rings from forming the bottle in one piece; that is often where the copper colours first, sometimes with a purplish sheen. Brown and black can stay; only green or blue deposits are worth removing before you refill. If you want to clean the inside, shake lemon juice with a tablespoon of salt in the closed bottle, rinse thoroughly a few times and let it dry upside down.

More on this: dark spots inside your copper bottle and 8 mistakes with a copper bottle

A black velvet pouch comes with the water bottle, the cup, the mug, the bracelet, the tongue scraper and the tensor ring. It protects your copper on the move and in the cupboard, and it keeps the air off the metal, so the shine from your last polish lasts longer. Velvet has a pile that holds on to fibres, and on black every pale fibre stands out at once. It sits loose on top: with a lint roller, the flat of your hand or a dry clothes brush the pouch is back to an even black in half a minute.

More on this: what the velvet pouch is for and how to keep it clean

Yes. Drinking water in Europe may not be aggressive or corrosive, especially when it has been softened, and in the Netherlands softened water may not go below 1.0 mmol per litre, so that copper does not easily dissolve from pipes. After a night in copper your water holds roughly a tenth of the European limit for tap water, and a full bottle stays far below what EFSA considers safe per day. With soft water you also get hardly any limescale in your bottle.

More on this: soft or hard water in a copper bottle

They come from traditions that work with shape and geometry. The tensor ring goes back to the American metalworker Slim Spurling, the pyramid to a line that reaches into ancient Egypt, and electroculture to field trials by the British Ministry of Agriculture between 1918 and 1936. For each one we looked up where it comes from and what has been measured, so you can choose for yourself what suits you: read about the tensor ring of Slim Spurling, the history of pyramid energy and electroculture in the garden. Where tradition places copper in the home is in copper in Vastu Shastra and Feng Shui.

Align one side of the pyramid with the north-south axis and put it somewhere it can stay; whatever goes underneath sits at about a third of the height. The tensor ring hangs around the tap or lies loose beside a carafe or a glass. The electroculture rods go upright into the soil by the plants you want to start with, ideally a few spread across the bed.

More on this: using the pyramid, using the tensor ring and placing the antennas

Our bracelets are pure copper, without magnets, and that is a deliberate choice: the copper itself is what this tradition is about and what has been measured. More has been studied about copper on the skin than most people think, and Europe recognises eight official claims for copper as a nutrient. Why the magnet version became so popular is in the knowledge base.

More on this: with or without magnets

For centuries, copper simply sat on the table: as a cup, as cookware, as jewellery. Somewhere along the way it faded into the background, stainless steel and plastic took over, and copper became mostly something for the pipes, not something you'd drink from anymore. We thought that was a shame, because copper does more than just look good. It contributes to normal energy metabolism and helps protect cells from oxidative stress, two recognised European health claims for copper. In Ayurveda, water that has stood in copper overnight (Tamra Jal) has been drunk for thousands of years, and copper surfaces are known for their ability to kill bacteria. Kopero was created to give that combination, the practical benefit and the older tradition, a place in your daily life again: solid copper you can actually use, to drink from, to wear, to work with in the garden.

More on this: Tamra Jal, the tradition behind copper water

Copper is a soft, workable metal with excellent electrical and thermal conductivity. It reacts to air, water and touch, developing a natural patina: a sign of use, not a fault. Our products are made of solid, uncoated copper. In the material sample that was analysed, RTC Laboratory in Moradabad measured 99.21% copper and 0.75% zinc; that small share comes with the production process.

More on this: what our copper is made of and what research shows per product

Yes, by two independent laboratories. RTC Laboratory in Moradabad measured the composition and arrived at 99.21% copper and 0.75% zinc, to ASTM-1621 and IS-228. URS Products and Testing in Noida put a water bottle, a mug and a pyramid against the European rules for materials in contact with food: overall migration, odour and taste, nineteen heavy metals, and lead and cadmium in the material itself. Everything passed, and not one of those nineteen metals was detectable in the water that had been standing in the product.

More on this: what our copper is made of

Solid copper is not chemically refined to laboratory purity, and the production process always leaves a small trace behind. In the sample that was analysed, RTC Laboratory in Moradabad measured 99.21% copper and 0.75% zinc to ASTM-1621 and IS-228; the remaining 0.04% falls within the measuring range of the analysis. That is the purity solid copper arrives at, and exactly what you want in something you drink from and can polish back for a lifetime.

More on this: how to recognise real copper

Yes. Our products are solid, uncoated copper. For the water bottle, the mug and the pyramid, URS Products and Testing checked that against the European rules for food contact materials: of the nineteen heavy metals examined, none was detectable in the water that had been standing inside. Copper itself is also a trace element your body works with every day.

More on this: the eight approved EU claims about copper

Yes, and it is well documented. In 2008 the US EPA registered copper alloys as an antimicrobial surface after tests showed that more than 99.9% of bacteria such as MRSA and E. coli were killed within two hours, and researchers in Southampton and India built on that. It is a property of the metal itself, and exactly why copper became the tradition.

More on this: the evidence, from the EPA to Southampton

Plastic is light and cheap, stainless steel is neutral and lasts a long time, and both remain a container. Copper is the only one of the three that does something itself: it works against bacteria naturally, it is a trace element your body works with every day, it is endlessly reusable, and it carries thousands of years of tradition with it. You wash it by hand, and it takes on its own patina, precisely because there is no coating over it.

More on this: copper, plastic and stainless steel compared honestly and what is known about microplastics and your bottle

Our products are solid copper, the same material inside and out, with no lacquer or coating on top. So there's nothing that can wear off or flake away: with normal use and care, it lasts for many years. Scratches and patina are part of the material and don't affect its function; you can polish the surface back to its original shine at any time.

More on this: four copper objects that outlived the centuries

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We ship from Sunday to Friday. Order before 11:30 pm and your parcel goes out on the next shipping day, so a Saturday order leaves on Sunday. Deliveries are made Monday to Saturday, not on Sundays. Across Europe it usually arrives within three to five days; to the Netherlands and Belgium it usually arrives the next delivery day. Shipping costs vary by country: they are listed in our shipping policy and you also see them at checkout, before you pay.

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Contact us as soon as possible via the contact form or info@kopero.nl. If your order hasn't been processed yet, we're happy to adjust or cancel it. If it's already been shipped, you can use our return policy once you've received the package.

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You have a 30-day cooling-off period. If it doesn’t suit you, send it back and you’ll get your money back. If you use it for longer than you need to judge it, we may deduct for loss of value. See the refund policy.

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