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Penguin Mini/100 Rite-Size A Insert - 6 Pack

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At Marineland, we design our filter cartridges to meet the absolute highest standards of water purification performance and operational ease. Each preassembled cartridge slides easily into place, providing superior mechanical and chemical filtration, and making replacement fast, dry and effortless. The cartridge mechanically filters water through a pad of double thick poly-fiber. Debris and waste particles are trapped, and water is chemically filtered through Marineland's Black Diamond Premium Activated Carbon. Marineland "Rite Size Cartridges" designed for the penguin mini/100

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I recommend 3 stage filtration for any aquarium. Penguins are an all in one filter that does a great job. I've run most sizes and have not been disappointed.

These filters DO NOT FIT in the Marineland 350 Biowheel system by Penguin - I read a review here on the Walmart site saying that they did - They are too small.       I guess that is why we should not buy stuff online, and go to the store 1st, then, use those specs to buy online.

What idiot said these filters fit the Biowheel 350