Residue in a cup of tea using household filter

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I'd like to ask some insights re potential cause of residue in a cup of tea when I used water from household filter but no residue when I used the water bought from purified water vendor. I boiled the water from both sources and used the same tea bags. The filtered water showed lots of residue while no tea residue using the water that I bought. Both of them were very clear before dipping the tea bag. Hope you can shed some light.



Best Answer

Your tap water probably contains more minerals and your household filter does not remove them completely. (maybe your household filter is not working properly).

Bottled water use industrial food grade filtering techniques, they work better than home filters.

You could ask your city about the mineral content of your water, it should be publicly available.




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Why does my cup of tea have a film on it?

Scientists at the Institute of Food, Nutrition and Health in Zurich, discovered that tea leaves contain compounds called polyphenols. These have a habit of bonding with calcium carbonate in tap water. And when this happens, a film tends to appear at the surface of the tea cup.

What is the film that forms on tea?

The oily film on black tea is mostly made of some of the compounds in the tea \u2013 particularly, molecules called polyphenols \u2013 and calcium carbonate. Calcium carbonate is present in tap water, but its content varies from place to place. A higher concentration of calcium carbonate will create a thicker film.

What is the stuff at the bottom of my tea?

Since customers evidently prefer that their tea beverages be clear rather than murky, manufacturers of ready-to-drink tea beverages have long looked into tea sediment, which forms simply from the binding of polyphenols to proteins (assuming you've filtered out any bits of actual leaf).

Why does green tea have a film?

Up to the mid-1990s scientists believed the scum on a cup of tea came from a thin layer of a waxy substance that coated the leaves and helped to waterproof them. When the leaves were put in hot water, the film melted to form a thin oily layer that floated on the surface of the tea.



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