Haven't kept pool up since school started

You will just have to perform a SLAM either way. I am in the same situation, as my pump died in mid-September. Last year I left it uncovered and spent about a week or so in the spring getting it back into shape. I did it late April early May, before the temperatures rose. The only thing I didn't do was vacuum. I kept the SLAM going until I could brave the cold water to vacuum.
 
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