What should I record first?
Identify the drinking or cooking-water objective and check the exact model's supported reduction claims. A TDS meter can describe one aspect of membrane operation but cannot certify that every potential contaminant has been addressed.
What changes the recommendation?
Compare output under expected pressure and temperature, tank or tankless capacity, water efficiency, faucet placement and refrigerator routing. More stages do not automatically mean better performance or less service.
What should the service scope include?
Ask for prefilter and membrane part numbers, sanitizing instructions, replacement intervals, leak protection and the installed scope. An under-sink RO system does not treat showers, hot-water appliances or every tap in the home.
Apply the correct source evidence
Confirm the supplier on the property water bill. Port St. Lucie’s public report applies to its Utility Systems customers; a mailing address does not prove supplier, and a private well needs its own testing. See the Port St. Lucie source guide before applying a report or selecting a treatment goal.
Review the 2025 Water Quality Report for the appropriate source boundary. Source review: October 4, 2026. This guide provides decision questions; equipment selection and any safety-related interpretation require appropriate measurements and qualified advice.
Continue with the related decision
Reverse-osmosis service and filter changes · All solutions · Local Learn guide · Water check