Copper Tensor Ring Guide
The tensor ring works completely passively: you slide it around the tap or use it separately, without it ever touching the water itself. Below is how to do that, and how to keep the ring clean.
In six steps
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Unpack it and polish it once. Wipe the ring with lemon and salt (not too hard: salt is mildly abrasive and dissolves well in the lemon juice), rinse and dry immediately. This way you start with clean copper.
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Measure your tap. The ring is 4 centimetres in diameter and fits around almost any standard kitchen tap. If your spout is thicker, use the ring separately instead.
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Slide it around the tap. Place the ring just above the spout. It doesn't need to be fastened and doesn't touch the water itself.
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Let the water flow. The water moves through the open centre of the ring. Use it for drinking, cooking or watering plants.
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Or use it on its own. Place the ring next to a water bottle or glass, put a small object inside it, or hold it in your hand during meditation.
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Keep it clean. Wipe the ring with a dry cloth from time to time. If there's limescale on it, polish it off with lemon and salt (not too hard: salt is mildly abrasive and dissolves well in the lemon juice) and dry the ring immediately.
Patina is part of it

Untreated copper can become a bit duller over time, especially in the damp environment around a tap. That's normal; polishing once with lemon and salt (not too hard: salt is mildly abrasive and dissolves well in the lemon juice) restores the shine.
Cleaning

Wipe the ring regularly with a dry cloth to prevent limescale. If it does build up, polish with lemon and salt (not too hard: salt is mildly abrasive and dissolves well in the lemon juice), rinse and dry immediately.
This finish has relief. A cloth does not reach into the grooves, so acid stays behind there and keeps working on that one spot, which leaves blotches. After polishing, hold it under the tap for twenty seconds, turning it as you go, and only dry it completely afterwards.
A velvet pouch is included. Keep your copper in it when you are not using it: that saves scratches and keeps the air off the metal, so the shine lasts longer. Put it away dry. If you see pale fibres on the velvet, they are sitting loose on top and a lint roller lifts them off in a few passes. There is more on that in the velvet pouch.
Polishing brings the shine back. To hold on to it, a hair-thin layer of wax keeps the air off the metal and stretches it from days to weeks. That is what how to keep copper shiny is about.
Questions about this product?
The most common questions are answered on the product page itself, or check the general FAQ page.