I was told to push the dirt to the main drain

How much dirt are we talking about? Someone slip with a wheelbarrow?

If it's just a little, yeah, use the brush and sweep it to the drain - while it's running. Why the PSS didn't sell you a pole, a vacuum head, a hose, a skimmer plate, and anything else he could add on is beyond me. Must be a rookie....

If it's substantial amounts, like the aforementioned wheelbarrow incident, then a vacuum - to -waste is in order, assuming you have that option on your filter. Otherwise, a vacuum and then a backflush.
 
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