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900g per 2490 litres of water = 0.361 g/l (3dp)
Sounds about right for very hard water. Most of London will be similar. (I know you're not in London.)
https://wholesale.thameswater.co.uk/check-the-water-quality-in-your-area
Putting in my SW15 postcode I see I'm served by Putney Heath (no surprise as the reservoir is about 1km away from me and up hill from here) I get a result of CaCO3 of 259 ppm (which is also the same as mg/l).
Buy shares in whoever makes Viakal.
Greenbank
Soul
Average daily removal is 0.0898kg according to the report so 900g per 10 days.
That’s on an average so far of 249 litres of water used per day.
Live near Cambridge. Can confirm local water is shit.