After reading the posts here, ... I had a brain fart of an idea. May sound silly, but hey, could possibly save a life or prevent serious injury. This could be on the market already, … I dunno. They (pool designers, etc) should incorporate in the suction lines, some sort of limit (pressure or suction) switch where when the suction drain is blocked for a certain amount of time, or reaches a certain suction pressure, the pump will automatically shut off. When unblocked, the pressure switch (pump) will reactivate, suction resumes.
Example: Kid is swimming at bottom or side of pool, becomes trapped by a suction line. Limit switch senses no suction pressure, thus shuts down the pump. Pump stops, kid floats back to the top cussing and screaming mommy mommy. Meanwhile, while the kid is at the surface, the limit switch senses no blockage and resumes suction. It sounds like a good idea to me !!
Hey, if this didn’t make any sense, it’s because I had a long day- lol.