Jeremy, If you have a mesh cover, purchase small tarps and lay them over the mesh, and space them out, support them so they do not blow away. You must bring up the pool to SLAM level before closing and your CC should be .5 or less. I have a friend who this year forgot to place the tarps on and woke up to a green pool. This will keep the algae at bay.
You can pump back chlorine into the pool with a pump over the winter. I have also suggested filling up a 30-gallon bucket with water (when not freezing weather), adding some chlorine, and pumping it back into the pool. There are many things you can do. The key is to open up early enough, not necessarily close super late, especially with a mesh cover. I close my pool no later than 3rd week of September, and opened up last week, with a solid tarp. The water is clear. However, I recycle the water on the cover and pump it underneath the cover. I add one gallon of bleach on the cover and pump it back in a few times before the opening season.
As I mentioned, you have to think outside the box with your pool. This is quite a long time to clear up the water. I usually add one gallon before freezing temperatures (recycle tarp water) and add 1 gallon in March and 1 gallon in April. It is great having a tarp as it collects water and gives me an opportunity to save money and time. You can not do this with a mesh cover, but there are ways to stall the algae and keep the water clear. Good Luck!
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