There are a few variation of this method in the post that @ogiewon linked to above. Some have retrofitted a Samsung leak sensor and other like myself have used the Ecolink contact sensor that has extra screw down connectors that can be used to connect wires to a relay. A LOTsimpler than it sounds and it has worked reliably and instantly for me...without fail. Below is a link to the same post but further down into the thread where simpler options are discussed (the initial discussion is a bit more technical).
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