loud return

This is a new 500gal in-wall tank with a 100gal sump. I plumbed two returns, running off of a Syncra SDC 9.0 (2500 gph) and a Syncra High Flow 12.0 Pump (3200 gph). One return line is longer than the other, and they're running off different sizes of pump. However, both are making the same...

I recently purchased a Octo Varios-2 after my Sicce Return pump started family, this is how sounds like with the lowest setting (eco). In the video it's running The lowest before I set it to level 3 (normal). I kept reading this was the most dead silent pump in the market and took the bullet of...