I don't change my HOB filter cartiges for months at a time. I just rinse them in tank water. Occasionally I rinse them in the sink too though. Which isn't much different that getting a new one. The only thing is the carbon is probably worthless (as carbon at least) after a while. I don't use carbon in the sumps of my bigger tanks either though, so I don't really care about the carbon.
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450g-30"&20"0.bichirossum,18" cichla temX,12"p.ornatipinnis&lapradei,2x15"c.temensis,15 " c.orinocensis,12"L.platrhynchus, 30" Crock I gar
180g-10" d.pulcher,2x8"d. pulcher, 3x8"c.orinocensis, 7"jardini
90g-4"stripeneck musk turtle,8xc.macracanthus 3-7",2x7" s.tanereius
30g-2x7" a.batrachus
30g-4"p.delhezi&endlicheri, 4"m.irwini
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