I can not assure what has created the issue, maybe just bad one off tub, so I don't want to risk tarnishing the brands name that would not be fair, however we are switching to IO as of tomorrow.
Neither the manufacturer or I could come up with any suitable explanation other than a bad unit. The distributor offered to replace also for us which is very good service.
The switch out and not carrying on with it also coincides with us using balling salts and trace elements in it, so designer salts will not be required from here on.
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