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Frequently Asked Questions

 What is copper?

Copper is an essential trace mineral that the human body cannot synthesize on its 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. 

Bottles and Pitchers - UNLINED
Tumblers and tins - LINED

Which of your vessels contain a lining? 

Only the TUMBLERS and TINS are lined inside.

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.

What should I store in my water bottle?

As the name suggests, use PLAIN STILL WATER ONLY.

Can I put sparkling or carbonated water in my copper water bottle? 

NO - definitely not. Sparkling or carbonated water has an average PH of 4.5, making it quite acidic, sometimes they are even as low as PH 3.

Please DO NOT use sparkling or carbonated water in your bottles. It will taste horrible.

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 water continues to taste bad, please clean the inside of your bottle before continuing to drink from it. If it continues to taste bad after that, please contact us. 

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, but at times it can be lower than 5, so we advise against using this type of water with the vessel.

Please use COLD/ROOM TEMPERATURE STILL 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.

DO NOT put tea in this bottle. 

NEVER use ANY LIQUID with a PH lower than 6 in an unlined vessel for drinking purposes, please stick to PLAIN STILL WATER ONLY. 

Any acidic liquid you put into the unlined vessels will taste DISGUSTING due to increased leeching. You won't be able to palette it. The whole aim of these unlined vessels is to avoid sugary and acidic beverages anyways, helping you enjoy drinking still plain water, DO NOT DRINK ANYTHING ACIDIC FROM THEM. 

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.

Can I put my bottle in the fridge?

We recommend just using room temperature water, it may surprise you, but it tastes the best that way. It will still be cool and refreshing. Water this way tastes absolutely amazing, and the mouth feel is pure luxury. 

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. Please check with your water provider for this information. We, Kosdeg, have no control over or knowledge of what you will decide to fill the bottle with. 

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 known to be insoluble in water, but it can flake off the surface unlike the dull brown/black oxide later that forms, so please clean your vessels regularly using the advised cleaning methods by following the link on the card provided in the box. If you lose this card PLEASE contact us and we will share the link to the materials or advise you accordingly.  

Can I drink Lemon Water from the unlined Vessels (Bottles and Pitcher) 

No you can't. Please use PLAIN STILL WATER ONLY. 

Can I add essential oils to the bottle 

No. Please use PLAIN STILL WATER ONLY in the unlined vessels. 

Can I add salt to the water to the bottle? 

No. Saltwater corrodes copper. Recently we had a case where a customer had been using artificially created alkaline water PH 8.9 with "added Himalayan minerals". Turns out, the Himalayan mineral was pink salt, which caused the bottle to corrode heavily. We don't advocate using any of these artificial alkaline waters with our bottle, stick to PLAIN WATER ONLY.

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, and in extremely rare cases it may cause liver failure or death. 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).  Chronic over exposure to high levels of copper can cause harm to your health, which may be fatal depending on the levels consumed. 

If you suffer from copper sensitive conditions/illnesses, such as Wilson's or Menkes 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. 

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

As always, we recommend that you guys think and act for yourselves. After reading the below, please do your own research before purchasing and using any of our products. 

We as a company have no control over and accept no responsibility for what you as the user and owner or anyone who may be able to use the product as a result of you owning and or purchasing it, will put into the bottle and how it is used. 

Kosdeg cannot guarantee the quality of the drinking water put into the bottle. For the quality of your drinking water please contact your local council/water provider, or the company you purchased the water from. 

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. 

More cleaning and use instructions can also be found at

Please follow the card with the link to the cleaning and use instructions in the box and read them before using any product of ours. 

We've got some strange requests lately, some from people wanting to whip cream and eggs inside the bottle, one person wanted to blow torch the outside lacquer off, one person wanting to boil it on the campfire. The unlined copper vessels are intended to improve the taste of plain still water, thus making it more enjoyable, NOTHING ELSE. Please DO NOT partake in any of the previously mentioned activities. Take care of yourself, and your bottle, and you'll have great tasting WATER for many years to come.