Welcome!
I'm not the expert on winterizing pools with underground lines. Generally, though, I'm guessing it would be best if you could fill your underground lines with pool anti-freeze and plug them, disconnecting your pump and filter for the winter, and, perhaps, storing your cartridge in a cleaning bath, since it's in your basement already. You should be able to blow out the lines with a shop vac, rather than a compressor as vacs generally pack more volume and less pressure.

But...I'll let those who know better correct me.