When do you apply the solar pool cover?

You apply the solar pool cover either very early in the morning, or the night before you want to go swimming in the pool. Keep in mind, that if the sun hits it for long periods of time, it will make the pool water extremely hot, so make sure that it is in a partially shaded area if you are going to put it on the day before, and if the sun is always on it, then put it on the morning before you go swimming.