If the water is still clear-ish, purchase 2 gallons of 6% househould bleach per 10,000 gallons of pool water, and pour it in THIS evening. Otherwise, it will turn green faster than you'd believe, even with cold-ish water. (I'm assuming it's NOT frozen.) After adding the bleach, give it a day or two, and then recover, unless (see below) .
Otherwise, if it's already slimed and sludgey, it doesn't matter so much. But, you really can't start cleaning up, until you are ready to bring the pumps online. If there are leaves and branches in the pool, you can start removing them.
HOWEVER, if you are on the coast and are pretty sure you are now into frost free weather, you can go ahead and start work on the cleanup. It's sure to be fairly lengthy, if the pool hasn't been opened in several years.
One warning: DO NOT DRAIN THE POOL!
You will destroy the liner, if you do. And, if it's a concrete or fiberglass pool, it can literally float out of the ground, if you drain it, and the ground is at all wet.
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