It's confusing, but motors have separate models and info from pump (motor + wet end). An AO Smith C48L2N134C1 is a 1.5HP motor, though I don't know if it's 'uprate' or 'full rate'.

But anyhow, what we need is the PUMP model, which should be on a label somewhere on the wet end. Regardless, knowing that it's a 1.5 HP, we almost certainly know it's too big for your filter, which means your filter has probably lost sand during backwash . . . .which means it may not filter very well.

Adding sand to a S244T is a pain, unless you happen to have unions in place to make it easy. So, unless you have a "must be clear by May X" deadline, it would probably be better to test it with DE powder. Take look at the links, and see if you can find some locally -- you only need a couple of pounds to test the filter, but you can use more, to help clean up the mess:

Diatomaceous Earth Pool Filter D.E. 25 lbs



To test your filter, just add a couple of pounds (a couple of quarts) to the skimmer, and then go watch one of the returns. If you see white DE powder shoot back into the pool . . . you're going to have to work on your filter.