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Those are Ocean Clear pleated cartridge filters. They work just like the pool filters on those cheap DIY pools everyone sells. The pleated cartridge inside filters to 25 microns, and the pressure gauge tells you when the filter starts to clog. They need a good pressure rated pump to FEED them water from the tank (you shouldn't draw water through them). In a sense they do work like a canister filter of sorts. You could buy sponges to go in the center of the pleated cartridge for bio media as well. When the filter becomes clogged you have to pull them and rinse well with a hose. Then you soak them in bleach water for 24 hours and follow that with a 24 hour soak in clean water with Seachem Prime (or the like to remove the chlorine). If it were me I would buy 2 more pleated cartridges to set-up a rotation. They look like the model 340 filters.
I honestly wouldn't use them as my filtration due to the hassle, but they do have the benefit of filtering the water very well for particulates.
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