First off, it's past time for me to clean my cartridge filter. My skimmers seem to be sucking at different strenths. The one farthest from the pump has much less suction than the other. It's enough to vacuum, but still noticeable. It hasn't always been this way. Is it likely I have an obstruction from vacuuming? If so, how do I determine this and solve it? My deck jets don't shoot nearly as high anymore either. I'm assuming that one is tied to the filter. Is that a good assumption?