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Amazon.com: Marina Bio Clear Ceramic Replacement Cartridge for Slim Filters, 3 Pack – Optimal Filtration for a Healthy Aquarium,White : Everything Else
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Amazon.com: Marina Slim Filter Carbon Plus Ceramic Cartridge, (3 Pack) , 3 Cartridges each : Everything Else
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Marina Slim Filter Bio-Clear Replacement Cartridges for S10/S15/S20 Slim Filter - The Aquarium Shop Australia
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Wanted to hack my Marina Slim HOB so I don't have to buy their filter cartridges. New to the hobby, any advice as to filter medium to replace the cartridges with? This
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