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We have a watchdog system and it works fine. The backup sump saved our asses a few years ago when the main pump failed during a big storm. The smaller backup pump was able to keep up for enough time to get the main pump replaced. Another part of this is that it's a godsend if you can find a local plumber that you can trust to do good work. Luckily for us during that storm, we called our guy and he was out within 10 minutes.
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