I agree with this, they are really only built for bio filtration (they do nothing for water clarity), although by using aragonite mine also accomplished extra buffering capacity as a reactor, another boring (yet often overlooked) attribute with the right media.Are you disappointed with the rainbow lifeguard or fluid sand filters generally?
Fluid Sand Filters are poorly understood. It may take 6 months for the bacterial to colonies successfully and they don't do any mechanical filtration so they never need to be cleaned (ever). Slow flow that stirs is all that is needed. They are dull boring reliable and extremely effective. Just safe guard against back flow and top up worn media as needed.
And why I built my own extra tall so media would not overflow and escape to damage pumps.
and used a pro quality PVC check valve to prevent the kind of back siphon that can ruin pump and impellers impellers. I also hung a filter sock under its effluent just in case.
And kept mine in the dark, to avoid algae, and because benificial bacteria are theorized to do a better job away from light, mine was actually under a basement stairway, to help avoid extra light.