Costa Del Sol bathers on jellyfish alert! I say bring in the porous one immediately! Posted by Gary at August 10, 2005 02:45 PM | TrackBack"Bathers are warned that the jellyfish, which is of the "pelagia noctiluca" species, are small (5cm diameter) and transparent, and that its sting burns and leaves a red welt. Normal treatment consists of applying a solution of salt and magnesium sulphate (3.5g per 100 ml water), or vinegar, directly to the affected area."