Will 24 ft diameter pool heat faster by the sun or with a solar blanket during the day?

Adding a solar blanket will definitely increase the amount of heat gained and held by the water each day compared to using no solar blanket at all. And remember to keep the solar blanket on at night also to keep the heat from the day in the water rather than transferring to the air. Hope this helps ... I disagree. While I have no "data" either way, my experience (and common sense) tells me: On a sunny calm (not windy) and warm day, you will gain more heat with the solar blanket off than on (since the blanket actually blocks some of the sun). On a windy, cloudy, or cold day, evaporation cooling may be greater than the sun warming effect so leaving the blanket on makes sense. Leaving it on day or night also makes sense if conserving water or chemicals is your main goal (reduced evaporation). Leaving it on at night or when the temperature of the water exceeds that of the air by some amount also makes sense. Leaving it off day and night early in the season when the water is colder than the air also makes sense (it will hold the cold in). Leaving it on too long (day or night) makes your pool green. Make any sense?