Since you don't get freezing, I'm not sure how to answer your question. However, as your water gets colder it requires far less chemicals to stay balanced. Below 60, algae has a rough time growing and is easily inhibited. Even below 65, it slows down a lot, so the cooler temps may take care of themselves. Here in the NE we have to plan for much colder weather and freezing, so lines have to be cleared or removed, pumps stored, returns and drains plugged, etc.