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Section constantly under review and currently being updated, if you have any questions please email us at

At Kosdeg we are constantly testing and reviewing our products to ensure you always have the safest, most informed way of using and owning them. 

What is copper?

Copper is an essential trace mineral that the human body cannot synthesize on it's own.

Which of your vessels are unlined? 

At present, all of our water bottles and pitchers (both sizes) contain no lacquer coating on the inside. 

Which of your vessels contain a lining? 

There is a protective coating on the inside of our tumblers and cocktail tins at present. This is so you can enjoy a greater array of drinks in them. This lining may wear away over time, if after a period of time the taste of these vessels becomes unbearably metallic, or any green substance/liquid appears, please do not drink the contents and tip it out immediately. Do not continue to put acidic substances inside other than for cleaning purposes only if this happens. If your product is within the warranty timeframe, please contact for us a replacement.

How should water taste from an unlined vessel? 

The water should taste refreshing and smooth. It may have a slightly metallic taste in the beginning, but it should not be unbearable. If the taste of metal is overpowering, tip out the water and replace it.

If the metallic taste is overpowering this could be because: 

You've left it sit too long in the vessel - 4-8 hours is the sweet spot, but this may vary depending on the water you are putting into it. More acidic water will leech more copper.

The water you have put into it already has a lot of copper in it.

The water you have have put into it is acidic - Distilled water is slightly acidic, alongside the tap water in many states. Reverse osmosis water has a PH between 6 & 6.5, so we advise against using this with the vessel.

Please use COLD/ROOM TEMPERATURE WATER ONLY in our unlined water vessels - These include, all the copper bottles and water pitchers (both sizes).

DO NOT use hot/boiling water in any of our copper drinking vessels.

NEVER use ANY LIQUID with a PH lower than 6 in an unlined vessel for drinking purpose, please stick to plain water ONLY. 

If you are using lemon juice or any other acidic item to clean your copper vessel, NEVER DRINK the solution during or after cleaning. The acid in the liquid dissolves the surface tarnish layer into it, alongside a lot of copper and is toxic if ingested.

How are your items packed?

We're trying to eliminate as much plastic as possible from our packaging - at the moment we're down to just a tiny piece of tape and looking to improve that! We want whatever you receive from us to be as low impact as possible.

Can I put hot water in my vessels? 

No  - Please do not put hot water in the vessels. Not only can it hurt and burn you, it will increase how much copper and how fast it leeches into the water.

Can I put my vessels in the freezer? 

We advise against it. The bottles and pitchers - Definitely NO - After a while in the freezer the bottle will split. Please DO NOT put it in the freezer.

The amount of copper in your drinking water will depend on various factors, the main ones being:

Putting acidic substances into the vessel
- For unlined vessels, adding acidic substances will cause larger amount of copper to leech into the water more quickly. Please do not use ANY acidic substances for drinking purposes in your unlined vessels. Some tap water is 

The temperature of the water - the hotter the water, the more copper is leeched. 

The PH of the water - the more acidic the water, the more copper is leeched. PH of water will be dependant on location and source.

The level of copper already in the water you put into the vessel - the target level for copper in drinking as advised by the WHO currently stands at 1.3 MG/L. This is to ensure that everyone can consume copper enriched drinking water for long periods of time with no recorded adverse health effects.

How long you let the water sit in the vessel for - The longer it sits, the more copper that's absorbed by the water.

The level of tarnish that has formed - The level of tarnish formed on the surface layer of copper will inhibit how much copper is leeched into the water. The green verdigris layer, which is commonly copper carbonate, is soluble in water, so please clean your vessels regularly using the advised cleaning methods. water The dull black/brown tarnish on copper is usually copper sulfidecopper sulfate, or copper chloride which are removable with acid. 

You can have too much of a good thing: 

Although essential for good health in small amounts, very high levels of copper could cause copper toxicity, which may result in nausea, abdominal pain, vomiting, 
diarrhoea and headaches. The WHO currently recommends that drinking water should try to achieve a level of 1.3 Mg/L or 1.3 PPM of copper to be safe for consumption throughout the population. On average, water stored in these vessels should only reach a level of 0.4PPM or 0.4MG/L after being stored in them for 8 hours. (this may very depending on the water in your area/bottled brand).  You should never reach a level that could cause your body any harm.

If you suffer from copper sensitive conditions/illnesses, such as Wilson's disease, we advise you not to purchase and/or use our products.

If you think you may be sensitive towards copper consumption, please consult your doctor or GP before purchasing.