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The autoshutoff has a pressure selenoid that senses back pressure that closes a valve. That selenoid valve should be attached to the feed water so that when the float closes causing back pressure the incoming water is turned off. If the feed water is not turned off, water will continue to flow through the unit and down the drain.
I assume from your last post that the PSI back presssure was not sufficient to close the selenoid until you replaced your filters. Glad you worked it out.
Mike
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