Four honest paths. The right one depends on your evidence, your home and your authority to change it — not on what pays best.
| Learn | Test | Product | Professional | |
|---|---|---|---|---|
| Best for | Understanding before spending | Unclear cause or named contaminant | Drinking-water fixes, renters | Whole-home install for owners |
| Cost | Free | $12–$250 | $80–$1,200 | Quote after visit |
| Evidence you get | Context | Measured values for your tap | None — relies on existing evidence | On-site measurement |
| What it can't do | Fix anything | Fix the problem by itself | Treat whole-home issues | Replace missing evidence |
| Start | Guides | Tests | Products | Check availability |