🐋🐋【Strong Compatibility】: Umlecoa Rite-Size C replacement filter cartridges are designed for MarineLand Penguin Power Filters, perfect compatible with Marineland Penguin PRO Power Filters 275/375 & Original Penguin Power Filters 200/350. It‘s great choice for your MarineLand Aquarium Penguin Power Filter. | 🐙🐙【Quick Installation】: Rinse the new filter cartridge under cool water to remove carbon dust, align the cartridge bottom key slot, insert the filter cartridge into the filter chamber, and make sure the filter cartridge fits completely into the MarineLand Penguin Power Filter chamber. | 🐢🐢【Excellent Performance】: Ready-to-use Aquarium filter cartridges for MarineLand Penguin Power Filter are made of high-quality cotton and coconut shell activated carbon, triple water filtration effect. Keep your aquatic organisms healthy every moment. | 🐠🐠【Sincere Advice】: According to the test, the Fish Tank filter cartridges has already withstood too much impurities for no more than four weeks, so you need to replace it with a new one. For optimum performance, replacement approximately every 2-4 weeks is recommended. | 🐟🐟【100% Satisfaction】: We maintain a thorough quality control process to ensure perfect compatibility with MarineLand Aquarium filters models. If you have any questions, please feel free to contact us! We offer a prompt, courteous refund or a new replacement pack within 24 hours.