I have one of those back-ups that uses water pressure. I haven't lost power since I've had it but I do test it every 6 months by unplugging my regular pump and dumping 15 gallons and it seems to work great.
I must be an idiot because I can't for the life of me picture how this works. Yes, I will go to google/youtube after posting this, I just wanted everyone to understand, I am stupid.
And I confirmed my stupidity. It is, in fact, a thing, that I will need to look into. I need a sump update and would love to get rid of my battery.
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