Bretton Wade

I also added a DOS refill service to my fork at https://github.com/brettonw/apex-ha

Can I buy you another coffee? :)

FWIW, I used the [customize](https://www.home-assistant.io/docs/configuration/customizing-devices/) feature to work around this. ``` customize: sensor.apex_salt: unit_of_measurement: ppt sensor.apex_lls: unit_of_measurement: in ```

Another approach would be to set the state_class of all the [sensor types to 'measurement'](https://developers.home-assistant.io/docs/core/entity/sensor/#long-term-statistics): ``` self._attr_state_class = SensorStateClass.MEASUREMENT ``` in ApexSensor.__init__