Circupool RJ45, low salt and check cell light on

This was their repsonse:

That is not rust, the plates are titanium so they won't rust but what you see is the ruthenium coating that is on the plates. Sometimes it can have brownish color like yours and sometimes we even see that it has a slight green tint to it. Nothing to worry about but I'll make a note on your account that you contacted us about this just in case you do start having any issues with the cell.
 
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