locally there around $295. on eBay for a Phresh filter it would cost $300 and up ... however i found an Ipower filter. there around $150 amazing deal.. reversible flaNG . this website says they use the same charcoal type as rhino filter which is a plus.
http://www.ebay.com/itm/6-Inch-Air-Carbon-Filter-for-Inline-Fan-Scrubber-Virgin-Charcoal-Odor-Control-/160849215446
now if it is packed the exact same i can't see why the device wouldn't work the same..
also i have a 500 CFM fan would i be able to use the 8 inch filter they don't list there specs but i would assume its around 700-750 cfm
http://www.ebay.com/itm/6-Inch-Air-Carbon-Filter-for-Inline-Fan-Scrubber-Virgin-Charcoal-Odor-Control-/160849215446
now if it is packed the exact same i can't see why the device wouldn't work the same..
also i have a 500 CFM fan would i be able to use the 8 inch filter they don't list there specs but i would assume its around 700-750 cfm