Am typing this on hols so can't post pics (yet), but I use a pair of Two Little Fishes reactors in line, tapping off my sump return and feeding a UV lamp before returning water to sump. I prefer 2 reactors to 1 as it means I have permanent phosphate absorption in one, but can use carbon intermittently in the other. Can't remember why this was a good idea now*, but was on advice of bloke in LFS (Heritage Aquatics in Surrey) and it works for me...
Will see about pics when I get home if anyone's interested, nothing complex though!
Paul
*Think it was something like Carbon absorbs good stuff and bad stuff, so you want to leave it off sometimes, plus C needs changing more often than PO4 absorber and if left to same frequency can leach bad stuff back out into water.