I try to keep filtration as simple as possible in my tank. The sump is split into 4 major compartments.
Water from the display tank enters the sump in the first compartment via 2 x 50mm pipes. A Deltec SC2560 skimmer resides in this compartment after a baffle.The outlet of the skimmer is directed into this first compartment as well.
Water from the first chamber then flows over to the 2nd one filled with filter floss and 3 bags of BioHome. Filter floss is changed every week. BioHome is a sintered glass filtration media which houses beneficial bacterias. I rinse these off from detritus every month during water change.
The 3rd chamber is a DSB around 7" deep with Chaetomorpha algae and some live rocks above. This refugium is lit by a twin bulb Hagen T5. In the beginning I used to harvest Chaeto every two weeks, but these days, probably once every 3 months or so.
The final chamber houses all the pumps, which includes the 3 return pumps, Phosphate Reactor pump and the Calcium Reactor pump.
The Phosphate Reactor is a Reef Maniacs RFR-620 fluidized reactor fed by an Aquabee 100 pump with Rowaphos media. This media is changed out every 3 months, sometimes less, depending on the Phosphate levels.
I've also installed a Sander Certizon C100 ozonizer fed with dry air via a Red Sea air dryer. The ozonizer is connected to a Milwaukee ORP controller, and set to an ORP value of 380, running 24/7.