Stronnn

Hello all, I've had my current spa filter cartridge for just over a year now and am wondering if it needs to be changed. I've checked a few places online that say what an expended filter should look like but mine seems to be in great condition. The ends are not cracked and have very little discoloration. The white filter material is white and clean. (We use the tub about once a week, 2 people) The only spot I see a little debris is in the middle if I push open the filter "blades" and look between. It's mainly cat hair. That stuff get everywhere.... Anyways, should I not risk it and buy a new one, or keep this filter for another year? I don't want to needlessly spend money on a new filter when not needed.