I have a Hayward S200 sand filter that makes noise when the pump is turned on. It sounds like there are 2-3 rocks inside the filter that proceed to bang around when water starts to flow through it. Is this something to worry about? Can I just take the filter apart and look inside and remove any foreign objects if I see them, or is there a little more too it than that? I am a new pool owner and am leary about just taking things apart.

I downloaded the manual but that didn't seem to help.

Thanks,

Jeff