I have a 304 that until now has worked great. However, today I noticed that the flow coming out of the output tube had significantly decreased. I'm guessing down to below 100gph. I think that may have been why two of my clams died recently.
Anyway, I opened it up, cleaned off as much gunk as I could, and replaced the four sponges with new ones. I left the three trays of Bio-Rings alone, so I think I will be fine for bacteria. I also took out the impeller and cleaned the magnet part on both surfaces.
Now thats its back together, the gph
is up, but still not back to full force. I'm guessing now its around 200gph, while before it was closer to 250gph. Is there anything else I can do?