We had a very nice warm fall so far but tomorrow the bottom drops out and it gets cold here. I have some chlorine left over (two gallons) that I was thinking of adding to the pool which I closed about a month ago at slam level. Probably over kill, but I figured a little extra won’t hurt. Problem is how do I do it given that the pump is obviously off. Can I just dump it in or do I need to mix it somehow? If so, how and how much? I could pretty easily put a brush on a pole and move the water a bit as I pour the chlorine in, but is that enough or, even necessary?