Dual Bio wheels in the sump

[SteveS 22554]

Greetings!
Just bought a 120gal tank set up second hand. The sump has dual-bio wheels........ What are the thoughts on these as I have never seen them set up like this before. (Not that I have seen a lot)

 

[vetteguy53081]

This is an old concept wet/dry filter and was popular in its' time known as Marineland Tidal wave.
I would deem this as still effective and if media is added to drip trays would make a totally effective filter unit

 

[SteveS 22554]

This is an old concept wet/dry filter and was popular in its' time known as Marineland Tidal wave.
I would deem this as still effective and if media is added to drip trays would make a totally effective filter unit

Thanks! There are 4 trays on each side and will be using them to the fullest extent possible.