Start with the job you need done
“Whole-house” describes treatment serving the property’s incoming water. “Reverse osmosis” describes a membrane process. They are not interchangeable product categories. Your choice should begin with the water report, desired use and required flow.
Compare the scope
| Question | Whole-property proposal | Drinking-outlet proposal |
|---|---|---|
| Which outlets? | Ask for the exact plumbing coverage | Identify the dedicated outlet |
| Design flow? | Explain simultaneous household use | Explain drinking and cooking needs |
| Maintenance? | Ask about every installed component | Ask about the entire outlet system |
| Verification? | Define sampling points after installation | Define the final drinking sample point |
Ask about performance claims
CDC describes several home-treatment technologies and their different capabilities. Ask the provider for documented claims for the exact model and target parameters. Do not treat “multi-stage” or “premium” as a specification.
Consider the whole installation
Ask where equipment will sit, how it will be serviced, whether drainage or electricity is needed, and what happens during a fault. Include storage and plumbing after treatment in the conversation. Request a clear distinction between required components and optional additions.
Compare recurring responsibilities
Who buys replacement parts? Which technician services the system? What checks happen after replacement? Ask for a maintenance schedule based on the selected equipment and operating conditions rather than a universal interval.
A useful decision brief
Write down your report, intended outlets, household use, available space and service access. Send that same brief to each provider. A good comparison explains both the proposed outcome and its limits.
Take the next step
Read about reverse osmosis, whole-house systems, or prepare your treatment checklist.
Questions worth asking
Does this guide assess water at my property?
No. It provides general context and a preparation checklist. A property-specific assessment needs appropriate inspection or testing.
What can I do without contacting a provider?
Create the free water checklist, print it and collect the records and questions described in this guide.
Sources & scope
Centers for Disease Control and Prevention · General treatment principles; not Bali-specific
Retrieved 2026-09-07 · Linked and summarized; verify product-specific claims independently.