Anoroc,
When I refer to "rotating" my filters (5) on my Vanguard, I take the filter from the circ pump and clean it, (be sure and turn the tub off while you do this) and then move it to the next spot, I clean that filter and I rotate them in this manner. That way I don't always have the same filter on the 24 hr circ pump & therefore wear it out quicker than the rest!
Hope that helps!