I agree with the person who said it would be really hard to enforce the "potty-trained" rule, and it is important to remember that it isn't just infants and toddlers that might have toileting challenges. Many families that have exceptional children (children with developmental disabilities) cruise on Disney because Disney is so great with kids with DD, and other disabilities. Lots of kids with DD might not be able to independently toilet until they are in the late grade school years--- and still others might not ever get there completely. Also, many of these kids could have an "floater accident" in an unfamiliar environment, like a pool, even if they had been successfully toileting independently for years. That said, many people that have kids (or young adults) with these difficulties do take precautions to prevent the floaters. I was recently on a discussion list where people were sharing information about where to get non-disposable swim "liners" (basically like the swim diapers, but for older folks) for individuals over 60 pounds and over 100 or 150 pounds. Anyway, moving to a requirement for perfect independent toileting records (potty trained) would be such a loss of families with young children, as well as for families of kids with disabilities.
At our local pool, disposable swim diapers are forbidden. This is because the gel leaks when the pool water gets in. That gets in the pool filtration system and messes things up--- not to mention, the crystals are hard to see and very unsanitary to swallow. However, the REQUIRE (and often do infant/toddler checks) the plastic lined, waterproof, non-disposable swim diapers. I thought I had read somewhere that this was the
DCL policy--- no disposables, only permenant ones like the kind made by Flap Happy. As a result, just last week I bought several "extras" for our trip for our infant and toddler. I hope we can use them, but I agree-- they are flat, how would they possible know they had them on underneath?