Don't mention this to my engineer friends, they would be insulted, as I am far from being an engineer.
IMO used in conjunction with biofiltration, it is the best filtration method available.
I did tests in the lab, and found along with DOCs, it removes freefloating algae, and some parasites in the planktonic stage. It also removes heavy metals, and medications (should be turned off during treatments)
Protein skimmers are actually fairly simple, they just take some tweeking, and a bit more flow than most aquarists are used to providing.
My DIY one came from plans on koiphen.com, and is also a biofilter, because of the lava rock media used to create cascading agitation.
Below I compared fractionation waste with normal tankwater.
Fractionation removed 8-10 times the dry waste in a similar aliquot of tank water.
And although I didn't get microsopic photos, the removal of bacteria, and other protozoans presented a similar comparison.
A theme i think about every now and then....would love to use it in my sw tanks with the tons my guys eat....
And your pix show it working.
I know Duane's been using it, but one needs to be an engineer to mount his system