I have little experience with pool alarms of the sort you mean -- they are not used commercially -- but lots of experience with other times of alarms, and sensors . . . and there's a fundamental problem with almost all alarm systems:The only way I've seen around this is to combine an alarm with a camera, so you can easily check each alarm, and then reset it, if it is not a true alarm. I spent a few minutes with Google and Amazon, and looked at some of the "top 10" lists . . . and didn't see anything I'd recommend.
- If an alarm systems is sensitive enough so it never misses a valid TRUE alarm (like a kid falling in), then it is also sensitive enough so that it will have many false alarms!
- Conversely, if an alarm is set to avoid all false alarms, then it is also set to MISS some TRUE alarms!
What might work well is a conventional alarm system, with a motion detector on the pool deck, a camera on the pool deck, and gate alarms. I personally use the SimpliSafe system (https://simplisafe.com/) and could set one up -- for myself -- if I was trying to do what I described. On the other hand, I know the conventional monitored alarm my uncle has on his property would be a total pain set up that way.
Bottom line?
I don't think there is any 'works out of the box' pool alarm solution that is better than mediocre.
Sorry!
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