That is why I like the tunze ATO. It has an upper float valve that will prevent the ATO from filling if it is over a certain level. I have also combined this with a 10 gallon resevoir that shouldn't kill anything even if everything was dumped into my system. The only problem is I only get about 5 days before my resevoir is empty so someone does have to fill it when I go away for a week.
Sorry for your loss.
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