West Ashley is on city water, so this is something we recommend only when there is a real reason for it.
What people usually notice
The taste and smell of chlorine is the common one, and a filter at the kitchen tap deals with that for a fraction of the cost of a whole-house system. That is often all anyone actually needs.
Rusty water in the morning is different
If your water looks brown or orange first thing and clears after running, that is very likely old galvanised pipe inside your own house rather than anything wrong with the supply. A filter hides that; replacing the pipe fixes it. We would rather explain the difference than sell you the wrong thing.
Where a whole-house filter does help
In homes with older pipework, a sediment filter protects your taps, appliances and water heater from the debris coming off the inside of those pipes. That is a modest, sensible piece of equipment.
Ask for a test first
If anyone recommends equipment without testing your water, they are working from a price list rather than from your house.