I have. My old 50 got overdosed with kalk.
before:
after:
In my case, I had allowed the auto top off reservoir to empty and display was probably a gallon or two low. When I refilled the top-off reservoir the tank called for 2+ gallons of water which ran through my kalk reactor. So it was 2+ gallons of saturated kalkwasser. It happened on my way out of the house in the morning and sat like that till I got home at 5:30. To make matters worse, I normally had an alarm set up my tank to tell me of a problem, but had recently got a new computer and hadn't configured it yet on the new machine.
In retrospect a couple lines of code to shut off the top off if the ph got too high would have been all it would take to prevent the accident.
Truthfully, my tank has never looked even half that good since and it has been more than 3 years since it happened.
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