I'd rather not have to continually be cleaning filters, since any sand will easily pass through, and be expelled.
No reason to replace a rotor unless the seals wear out, just replace the nozzle if necessary.
Once the system is flushed you shouldn't be getting much of anything to expel.
Most landscapers leave in whatever nozzle that comes with the rotor, which may not be the best GMP for every location.
It's very easy to fine tune your system to your yard.
Lots of info online.
Sprinkler Warehouse - Supplies for Sprinkler & Drip Irrigation Systems