
Came in handy in my old 330 Marineland filter. Nightmare for my new 350 Marineland filter. A 350 cartridge will not hold a Nitro Zorb. Finally found a way to use an old cartridge and tie it up so it doesn't end up on the bottom of the filter. This isn't Nitro Zorb's fault, but you can suggest another use case. Couldn't continue to use it if I didn't understand this suspension idea.

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