The older they get with the sponges losing structure over time, in what I have seen, they will clog up more quickly. Mine I will clean out every 3-6 months also depending upon what is going on in the tank. I need to clean mine out this weekend because I had a bunch of duckweed multiply out of control kill off other plants like the floating water wisteria, and get sucked up in the filter. This time has been 2 months.
Last clean out I noticed the solid structure of the side sponges which are in the sides of the filter baskets are much more squishy than originally. I think I am going to order a new set and start replacing one basket set every 3-6 months when the next filter clean out comes around. I have had mine, used but not very used when I got it, maybe 4/2013 when I set it up. They were very stiff then.
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 New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?
 Start here - Aquarium Advice Article
https://www.aquariumadvice.com/guide...ater-aquarium/
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves
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