James,
The max feed rate on that skimmers is 500gph.
You can find the information in the "More Details" tab on the product page...
http://www.coralvue.com/reef-octopus-dnwb150-classic-recirculating-protein-skimmer
In terms of a feed pump, you can use any of the following:
Water Blaster 2000 -- http://www.coralvue.com/reef-octopus-water-blaster-2000-pump
OTP 2000 -- http://www.coralvue.com/reef-octopus-otp2000-circulation-water-pump
Hope this helps...
Carlos
CoralVue