The only drawback is that you will have to take care of a pool that you can't swim in yet because the water will be too cold for awhile yet. But, I also sometimes have to open my pool early because we start having hot days and if I don't, then I know I'm gonna open to pea soup green water instead of clear water. I've opened my pool in March several times and if not then, always in April.
You will have to start adding bleach, etc. and filtering, but in my opinion, that is no big deal. By this time of year, I am usually pretty anxious to start messing with my pool anyways. And, if you do happen to have a night that does goes below freezing, you can just run your pump through the night and nothing will freeze up. As long as water is moving through the equipment, it won't hurt a thing.
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