When we first got to the Roof Terrace the water was very warm, which suprised me. But the next morning, following the heavy rain last Thursday Morning, the water was cold and the surface was covered with hundreds of flies. I ran the Cleaning button a few times which sucked the flies into the filter in the corner but not all of them, a gauze net would have been useful.
You could alter the temeperature of the water up to 40C