Planted Tank Guru
Join Date: Jul 2008
Location: East Lansing, MI, USA
Two things I don't see mentioned, that have happened to me with ECCO filters.
On one, the impeller - from the box - had broken fins. All were broken identically, so it may have been that someone bought it, tampered, and returned it. It was my first ECCO so I didn't know better.
Another time, the hoses filled with slime. Blasting water from the faucet cleared that up in a hurry, but the pump didn't.