Our local D W have drastically reduced the temp' of the pool claiming it is to reduce the chances of members catching Legionnaires disease!! Is anyone else a member of D W and if so have they done it at your pool?????
If you google, there is a lot of stuff about the risk of Legionnaires in spa baths (which are by nature warmer water) but I can't see anything yet about swimming pool temperatures. I'll keep looking.