You’re looking at $500 to $4,000 for the whole shebang. That includes the unit itself and the installation. Yes, that’s a massive range—like choosing between a used hatchback and a shiny new SUV. The price depends on what you want filtered out and how fancy you want to get.
Don’t panic yet. The lower end is totally real for a basic setup. The higher end is for those who want water so pure it might start writing poetry.