Undersink filter for awful tap water

[Alwaysmore]

Just moved to UK/London/Richmond and our tap water is horrid.
Not sure if it's limescale or just pollutants but my cup of tea has a scum that floats on the top of it.
We're currently using a Brita jug which helps but as a large family it's becoming such a pain to keep refilling it as no one ever remembers.
Can anyone recommend a great undersink system?
Any that remove limescale as well? Ideally one that removes limescale is best as it seems quite bad in our area.
I've only heard of Water2 which is all over social media, but not sure about them.

www.kinetico.co.uk/hard-and-soft-water-explained/hard-and-soft-water-uk

This will tell you if your water is hard or soft and take it from there although there is a caveat on the site.

Is your sink clean? I live between 2 areas. One is clean all the time - cleaned properly once a week. The other (stainless steel) always seems to look dirty as a thin layer of limescale holds all stains and I use tons of viakal/cilit bang limescale remover.
Do your taps get limes scale crusts? Inside of kettle? Are there any rhododendrons locally?

These are pointers too to hard water areas.

Water softeners are available but from what I've read on here if I remember correctly , often people seem to leave a drinking water tap off the softener due to taste (?salts)

Thanks, I'm guessing it is water hardness and limescale.
I've even noticed that the toilets are stained in record time compared to anywhere else I've lived.

Yes - toilets stain for same reason- thin layer of limescale holding stains.
Maybe see if anyone locally has a softening system.

We have an in-line filter w a little additional tap. Water tastes way better. You don’t want a softener on the drinking water supply…

You have hard water. I used to live in that area. A Harvey water softener for the whole house apart from the kitchen tap, and a Grohe instant boil tap with a filter will solve all your problems. I think the Grohe tap has a BWP filter, so if you don't need the instant boil, then maybe just the filter could be purchased on its own?

You can get a brita undersink filter. We used to have one but then installed a Harvey's softener (even on the kitchen water tap). Best decision we made! Cleaning a doddle, use way less products and tea is clear.

We have the Kinetico water softener for all but the kitchen tap and then a filter they supplied on a separate tap at the kitchen sink.

Water takes unremarkable and we only have the change the the cartridge on the sink tap approx one a year.

Use the filtered rather than soft water for the kettle it does still need occasional descaling but much much less than before.

Had this in place since mid 1980's, it's come with us for a few moves all in Thames Valley. Would not be without it but can completely forget from day to day.