Good question Jonathon, they certainly use chlorine in the pools at Roda and as we had some problems with cleanliness of some pools I have asked Housing, the Administrator, if there is any legal requirement in Spain to, a. test chemical levels or b, notify someone on a regular basis what chlorine and Ph levels are just in case anyones hair should turn green or swimmers catch a plague or similar.
I still do not have an answer from Housing.