What TDS tells you
Total Dissolved Solids (TDS) is a measure of dissolved substances in water. It does not, by itself, confirm that water is safe or unsafe.
- Compare source and purified-water readings
- Consider purifier design and settings
- Use service history as context
When a TDS check is useful
A TDS review can support diagnosis when purification performance appears to change, but technicians may also need to inspect filters, membrane condition and flow.
- High output TDS can indicate reduced membrane performance
- Very low flow may point to other restrictions
- Post-service testing helps verify normal operation
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