Not sure if they use the same sanitizer at Disney's typhoon lagoon swim with sharks attraction but it is a purple chemical under the Ecolab brand name EBV. How do I know? My daughter (and son to a lesser extent) had their faces mildly burned by residual chemicals on masks this past March. My guess is they failed to rinse the masks fully following sanitizing. QUOTE]
My DS7 also complained that the mask burned his face but was fine after he rinsed at the shower. My face also burned slightly but was fine after I rinsed. In the future we will rinse the gear well in the showers that are available before the lagoon.