| http://www.w3.org/ns/prov#value | - An aquarium filter, comprising:a closed canister having a top portion and a bottom portion, a fluid inlet and a fluid outlet each communicating with a respective region within the canister and providing the only paths for fluid flow into and out of the canister, a filter element located within the canister, a discharge tube located within the canister, and a pump including a housing, the housing d
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