Calcium reactor pump flow

Looks a tad bit on the low. Is the impeller loose on the shaft? Maybe the impeller is wobbling around in the motor causing the rattling sound.
Now granted you don't want massive amounts of flow. Also I like having an upward flow in my calcium reactors. I like to have the co2 bubbles going through the media. Here's a vid of my current calcium reactor I built

https://youtu.be/6F3sj7T5Lkw

d575a1478f3484d400d735b4eb523bb5.jpg
 
That video is deceiving.
The Eheim recirculates water through the unit too, so what you see is not what comes out from the needle valve.
I have the same unit & have a Kamoer pump pulling water through the unit along with the Eheim. Runs just fine.
 
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