If your pool water is OK (ie, algae free) right now, and you maintain adequate chlorine levels (see Best Guess link below), you should be fine.
If you are cleaning up a swamp . . . you're going to need that main drain.
BTW, you might want to post your test results . . . and what you've been told to put in . . . and your gallons and pool type. 30# of alkalinity is rarely one of the first things you need to get a pool "up and running" . . . but pool stores love to sell it, especially if you don't yet know that it's just $0.40/lb baking soda.
Ben
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