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Buy shares in whoever makes Viakal.
Without the softener, I think half our kitchen cupboard space would be taken up by Vikal.
We've cleaned the shower screen about 90% less than before the install.
Soul-
We got a Kinetico softener (fits under sink), fitted by Simply Soft (Dartford). They run a flush after rinsing the filter units which Harvey’s don’t do. Harvey’s consequently can have an occasional salty taste). No power needed, £6 consumable salt blocks last a couple of weeks. We had it fitted just before the bathrooms were completely redone. Best thing since sliced bread - no limes ale build up at all, skin feels softer, more efficient laundry, dish washer, toiletries. We have a couple of un-softened supplies - drinking water to fridge dispenser and back garden tap. All else (including kitchen sink - so kettle and cooking) is softened. Cost about £1k, almost 18 months in and haven’t looked back.
LongAndWinding
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.