The direct answer
Installation starts with representative water information and usable flow data.
What it can—and cannot—do
The system needs a bypass, suitable drain, safe electrical supply where required and access for service.
What determines the next step?
Tight spaces, old plumbing, exterior exposure and pretreatment can change the work.
Can I use an online hardness number?
Use it only as background. A current tap test is more useful for equipment selection.
Does one system solve every concern?
No. Softening, filtration and reverse osmosis perform different jobs.
What happens after I enquire?
Your source, symptoms and property information are reviewed to identify an appropriate next step.