Thanks!

I definitely agree on him learning to swim ASAP, we've already been working on what we can in the bathtub (blowing bubbles, wiping water out of your eyes vs. rubbing, etc) while we wait for the weather to warm up. We do have door alarms from the house to the pool, and the yard is fenced in, but the pool itself is not fenced off within the backyard. An in-pool alarm would be a supplemental / extra alarm for us, as really nothing can substitute for a sharp supervising eye.

We've been talking about putting the deck-mounted alarm next to the ladder as well to minimize the trip hazard, but need to do some closer analysis to make sure the ladder is far enough away from filter system returns and the alarm would still be able to "see" everywhere in our kidney-shaped pool.