{"title":"Water Bottles","description":"\u003cp\u003eA copper water bottle is meant to stand still. You fill it in the evening, let the water rest overnight and drink it through the day. That habit is called tamra jal and comes from Ayurveda; where the tradition comes from and what the source text actually says is set out in \u003ca href=\"\/blogs\/kennisbank\/tamra-jal-de-ayurvedische-traditie-van-water-drinken-uit-koper\"\u003etamra jal\u003c\/a\u003e.\u003c\/p\u003e\u003csection class=\"kopero-composition-update-20261021\"\u003e\u003ch2\u003eNew composition analysis - 21 October 2026\u003c\/h2\u003e\u003cp\u003eRTC (2021): 99.21% copper and 0.75% zinc. URS (21 October 2026), a separate bottle sample: 99.18% copper and 0.498% zinc.\u003c\/p\u003e\u003cp\u003eThe new report concerns one copper bottle. It cites ASTM E 478:2008 as its reference method. It is a composition analysis, not a migration or food-contact test. No batch number is recorded.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/pages\/test-dossier#meting-2026\"\u003eRead the test dossier\u003c\/a\u003e\u003c\/p\u003e\u003c\/section\u003e\n\u003cp\u003eOur bottle holds 900 millilitres and is made of solid copper, independently measured at 99.21% (RTC 2021) purity and tested against the European food safety standards. No coating and no inner lining. Whether nine hundred millilitres is the size that suits your day is covered in \u003ca href=\"\/blogs\/kennisbank\/welke-maat-koperen-fles\"\u003ewhat size copper bottle\u003c\/a\u003e. You choose between smooth and hand-hammered; the copper is the same in both, and what that difference means day to day is in \u003ca href=\"\/blogs\/kennisbank\/glad-of-gehamerd-koper\"\u003esmooth or hammered\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eCopper darkens over time. That is part of it, and it comes off again with lemon and salt (not too hard: salt is mildly abrasive and dissolves well in the lemon juice), as described in \u003ca href=\"\/blogs\/kennisbank\/koperen-fles-onderhouden-schoonmaken-polijsten-en-bewaren\"\u003ecleaning a copper bottle\u003c\/a\u003e. How often this tradition has you drink from it is explained in \u003ca href=\"\/blogs\/kennisbank\/hoe-vaak-per-dag-zou-je-uit-een-koperen-fles-moeten-drinken\"\u003ehow often per day\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"kopero-premium-koperen-waterfles","title":"Kopero Copper Water Bottle","description":"\u003cp\u003eThis bottle is made for one habit: fill it with still water in the evening, let it stand overnight, and drink it first thing the next morning. In Ayurveda that is called tamra jal, copper water, and there it is not an afterthought but the fixed opening of the day. Where the tradition comes from, and what can reasonably be said about it, is set out in \u003ca href=\"\/blogs\/knowledge-base\/tamra-jal-the-ayurvedic-tradition-of-drinking-water-from-copper\"\u003ethe article on tamra jal\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eNine hundred millilitres is a deliberate size: enough for a full morning portion with a second glass after it, and still a bottle that fits in a bag. It stands upright on a desk, fits beside a bed, and opens with one hand.\u003c\/p\u003e\n\u003cp\u003eYou choose between \u003ca href=\"\/blogs\/knowledge-base\/smooth-or-hammered-copper\"\u003esmooth and hammered\u003c\/a\u003e. Smooth gives an even surface that reflects the light in a single plane. Hammered is worked by hand, so every piece has its own pattern of dents that breaks the light. The copper underneath is the same either way. Both are formed from a single piece of copper, with no seam and no solder, so your water touches nothing but copper.\u003c\/p\u003e\n\u003ch3\u003eHow to get the most out of your copper\u003c\/h3\u003e\n\u003cp\u003eStill water goes in, and nothing else. Carbonated water, lemon juice, sports drinks and vinegar are acidic enough to dissolve copper faster; pour those into a glass. How much you can sensibly drink from it per day, and why there is an upper limit, is covered in \u003ca href=\"\/blogs\/knowledge-base\/how-many-times-a-day-should-you-drink-from-a-copper-bottle\"\u003ehow often per day you should drink from a copper bottle\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eThe bottle is not dishwasher safe. Rinsing with warm water is usually enough, and a slice of lemon with salt (not too hard: salt is mildly abrasive and dissolves well in the lemon juice) brings the shine back now and then. The full routine is in \u003ca href=\"\/blogs\/knowledge-base\/maintaining-a-copper-bottle-cleaning-polishing-and-storage\"\u003ethe care article\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eAnd it will darken. Uncoated copper reacts to air and moisture and grows darker over the weeks, sometimes with green or black patches. That is normal, it is reversible, and it is also the clearest proof that there is no lacquer over it. When discolouration does mean something, read \u003ca href=\"\/blogs\/knowledge-base\/why-is-my-copper-turning-green-or-black-and-is-that-a-problem\"\u003ewhy is my copper turning green or black\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eStill weighing up copper, stainless steel and plastic? \u003ca href=\"\/blogs\/knowledge-base\/copper-vs-plastic-vs-stainless-steel-a-fair-material-comparison\"\u003eThe material comparison\u003c\/a\u003e puts the three side by side. Copper is the only one of the three that is naturally antibacterial, and the only one you polish back instead of replacing.\u003c\/p\u003e","brand":"Kopero","offers":[{"title":"Smooth","offer_id":54697656189269,"sku":"8720726791397","price":49.95,"currency_code":"EUR","in_stock":true},{"title":"Hammered","offer_id":54697656222037,"sku":"8720726791380","price":49.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/7259\/4005\/files\/kopero-waterfles-glad-1.jpg?v=1791102152"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/7259\/4005\/collections\/kopero-combi-waterflessen.jpg?v=1788937452","url":"https:\/\/kopero.com\/collections\/water-bottles.oembed","provider":"Kopero","version":"1.0","type":"link"}