Itās more of an infommercial.
What the article illustrates is a typical 3 stage home system, that might go on your incoming mains. Bear in mind if you take out the chlorine before any water goes into cold storage tanks, youāll need a UV system to stop microbiological growth.
Few people on mains supplies have issues with sediment, but it can happen. Maybe more common in commercial environments.
A self-sacrificing limescale/hardness filter is best used at a specific tap, in moderately hard water, rather than very hard, as unlike a salt softener (which puts large amounts of sodium into your now soft water), it doesnāt replenish itself with regeneration, so in hard water areas it can get used up very fast indeed (weeks).
As with any filtration, knowing what you have to work with from the mains is key, then establish what you need to take out and your usage, then the most practical/cost effective way to achieve that.