The Eden 501 has been the subject of criticism of its falling flowrate after a short period of usage. But proper maintainence at least once every 3 months should be fine.
I guess its partly due to the design and its wattage. For its flowrate it really takes in quite low wattage, thus the lack in power. Its not an Eheim where it is super energy efficient. The 501 sometimes can have problems bringing water up to a tank just about 1 feet plus above it.
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