I noticed the water in my penguin 250 filter was getting very close to the top. apparently the filters can get so dirty that the water is sucked in faster than it flows out. Of course keeping up on the filter replacement is the best way to avoid this. What do you all do to handle the possibility that a filter could clog and there would be several gallons of water that could flood the room? Is it possible to have a device that detects water overflow and turn off the power to the filter?