EHEIM extension Set for the EHEIM undergravel filters 354000 and 354100. Package content: 6 plates 9x9 cm.
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For an aquarium with 100x40 cm you need 20 additional plates, therefore 4x extension set.
For an aquarium with 120x40 cm you need 28 additional plates, therefore 5x extension set.
For an aquarium with 150x50 cm you need 56 additional plates, therefore 10x extension set.