From what I can tell the pools are well maintained. This year we were better prepared! A combination of ear plugs and ear drop anti-biotic drops prevented our nightmare from last year.
I cant remember the name but the drops can be purhased for a couple of euro in any spanish pharmacy. As soon as any of ours compalined of pain or water in the ear, we used a couple of drops and it did the trick. Obviously Im not in any way medically qualified to provide this as advise, just fyi !
http://www.roda-golf.iowners.net/