Self cleaning will help to reduce scale buildup but often isn’t enough to completely keep scale off the titanium plates. Before the buildup starts to short out the plates they should be cleaned. The buildup is a white substance that looks like salt but it is actually calcium or scale.
Turn off the unit if possible.
Fill a tall plastic cup with warm water and half a capful of pH down, or white vinegar – mild acid.
Put the cell in the cup for 30 minutes.
Remove and rinse off, may help to shake it if there is some stubborn scale. Try using a high pressure water nozzle.