bio pellets

i was looking through amazon for bio pellets found 10 lbs of abs resin plastic pellets beads sinking bio filter media corn hole for $15. does anybody know if this is the same stuff the fish stores sell for so much more or if you can get the same results using it .i personally don't think it works but i paid so much for the reef dynamic reactor ill keep using it if i can get the pellets cheep.
 
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