The squares are called Dricore. Google it, there is a wealth of information. Usually it is used if the moisture is on the floor already, not from above-wet bathing suits, towels, life jackets etc. Dricore is a sub-floor w/ a moisture barrier so that you can put down many floor types on top of it and not have to worry about the moisture damaging your carpet, wood etc. The surface is treated w/ a moisture resistant sealer, I am not sure that it would stand up to the prolonged moisture from the stuff you say hits the floor.
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