W12 reverse osmosis membrane
The RO membrane for the Cyrcadia W12. Replace every 12 to 24 months.
Measure dissolved solids in your own tap water, before and after.
A TDS meter measures how much mineral, salt and metal is dissolved in water and shows it in ppm. The most direct way to use it is to measure your tap water first, then measure what comes out of the purifier.
TDS measures how much is dissolved, not what is dissolved. A sharp drop after filtration shows the system is working, but TDS is not a safety test and does not replace laboratory analysis.
Measuring at the same point every so often is the simplest way to see when filter performance starts to fall off.
| Unit | ppm (parts per million) |
|---|---|
| Display | Digital |
| Use on | Tap, drinking, filtered and aquarium water |