The ES3 copper and silver electrode kit is for the model pictured below & purchased from 2017. The lifetime of these electrodes varies but the average expectancy is between 18 months to 4 years depending on bather load and pool volume.
The electrodes are 65mm long and easy to remove and replace; supplied in pairs, these come with lead and plug attached for easy installation.
APVMA approval number 58847/01/1005