Type your postcode in the box on this page
That will give you a page with a table with hardness at the top. Tell us the number for "hardness German". That's the same as dH, one of the two units used in fish keeping. There is a calculator on here to convert it to ppm, the other unit used in fish keeping.
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Find out more about your water, what's in it and even dishwasher settings by searching with your postcode.
www.stwater.co.uk
That will give you a page with a table with hardness at the top. Tell us the number for "hardness German". That's the same as dH, one of the two units used in fish keeping. There is a calculator on here to convert it to ppm, the other unit used in fish keeping.