it lets E coli throuugh? through what exactly ? a .5micron membrane isnt used in budgie smuglers so thats a load of tosh, unless E coli bacteria have grown in size and are all now 100micron so woven poly / cotton can filter them out.
I was told its to discourage people from playing volleyball etc on the beach , then going swimming and transfering sand / mud into the pool and its filter systems ,
and I was also told that is to stop pervs being obvious pervs in public. this might be a load of tosh .
i personaly beleive a french woman brought in the law so that a) All the frechies could laugh at overweight pasty English and Germans or B) there would be no misrepresntation of the fact in the ‘man inches’dept.