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It is tap water.
For spring/mineral water, it will be from a groundwater source typically private
Radnor Hills Is a company that came to mind
https://www.radnorhills.co.uk/about/our-story/
musa
@CheBeef
Thanks for clearing that up Musa.
But I am still non the wiser.
So if I don't have a filter under the sink, it tap water (from south west London) or bottled spring water clearing?