As far as I can work out, swim nappies are more for containment than stopping wee escaping iykwim? We've got the same one and have our doubts it would contain LO explosive morning poo.....luckily he's usually done it by the time we go to waterbabies - he has so far anyway!
I also think that the water turning a different colour is maybe a myth to stop people peeing in the pool on purpose....!
Wee is not a problem in swimming pools. It's sterile when passed, and is neutralized on contact with chlorine. There is nothing in the world which will keep it in a nappy when the nappy is in a swimming pool anyway! Swim nappies are just to contain poo, which IS a problem if it gets into the water. If your baby poos in the waterm the swim nappy should contain it long enough to get him/her out and change him/her.
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