How and when should I use my TDS meter?Updated 2 months ago
What is the TDS meter for?
The TDS meter included with your ZeroWater pitcher measures the Total Dissolved Solids in your water. Use it to:
- Confirm your filter is working (filtered water should read 000–005)
- Know when to replace your filter (replace at 006 or higher)
- Check your local tap water quality
How to use the TDS meter
- Press the ON button to turn on the meter.
- Dip the metal probes at the bottom of the meter into the water — only the probes, not the whole meter. Hold for about 5 seconds.
- Read the display. The number shown is the TDS in parts per million (ppm).
- Remove from the water, shake off excess water, and press ON again to turn off.
Always dry the probes between tests to avoid cross-contamination between samples.
What do the readings mean?
- Filtered water 000–005: Filter is working correctly. No action needed.
- Filtered water 006+: Filter is at end of life. Replace as soon as possible.
- Tap water reading: Tells you your local water quality. Higher tap water TDS means your filter will need replacing more frequently.
How often should I test?
Test your filtered water once a week or every few days during heavy use. Testing your tap water once when you first set up your pitcher gives you a baseline and helps predict how long your filters will last.
The display shows HOLD or won't turn on
See our dedicated troubleshooting guide: My TDS meter is stuck on 000 / shows HOLD.