Reef Factory TDS Manual page 5

Step two - set up the device parameters, i.e.:
- TDS value (water impurity level), at which an alert will be triggered. In order to set the
value, drag the red dot and place it on the water purity scale.
The water purity level is measured by the TDS sensor. If the water purity parameters exceed the
specified value (5 ppm by default), the TDS meter device will inform you about it, by generating
a sound alert and displaying messages on its screen. If you connect the device to Smart Reef
system, you will additionally receive automatic emails or text messages to your email address
or phone number.
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