1145 Ammonia X Cartridge Universal - fits modern U/G filters, PennPlax, 2pk. Filled with Zeolite -- 'Ammonia X' aka 'white carbon'. Cartridge mounts to top of lift tube - no matching with tube topper, get a clean tube topper every time you change cartridge.

1146 Filt-A-Carbon Cartridge - U/G. Fits PennPlax Undercurrent Undergravel filters driven by long bubble wall tubes. An old filter style, but one of the most efficient air-driven u/g's ever made.

1147 Small World 1 Replacement filters 2pk, PennPlax. Filled with black carbon on one side, sponge on the other.

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