Gale,
Unfortunately, I had a bad case of the flu and so wasn't able to attend. Perhaps you met with Jasper or Shawn in our booth? In any event, I'm sorry I missed you!
Not sure what you mean by similarities... the "Filtrific" uses a mesh basket for pre-filtration, and a polyflo coil for bio? The Nexus uses a spin vortex coupled with static Kaldnes for pre-filtration, and fluidized Kaldnes for bio. Nothing even remotely similar in both concept and application!
Question... in reviewing the Filtrific web site, it appears that the "system" is geared toward water features (rock and gravel bottoms no less). I can't tell from all the photos and drawings, but I didn't see any examples of the products configured for koi ponds. Do you promote the use of gravel in the bottom of koi ponds? Further, I see that the pumps you listed are submersible types... and so I assume that when you say you gravity feed from a bottom drain, you actually mean that the drain connects into the Filtrific box which is also connected to the skimmer line, yes? If so, how do you control flow rates between the two devices?
Kind Regards,
Bill