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The replacement foam disks are only available as a replacement cartridge as a whole which can be found at the link below, sku 200003
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could be better By peter on 6/25/2015peter wouldn't recommend this product to a friendkind of thin plastic and not very clear. can't really see the tumbling and I am replacing one that cracked on the side after 2 or 3 months. I bought 2 just in case.
excellent product easy to use By Bruce on 9/8/2014Bruce would recommend this product to a friendI just bought the BRS jumbo GFO reactor, this refillable cartridge, and BRS hi capacity GFO media
this cartridge was a joy to use, no mess, no spilling, no fuss
Bruce in Chicago
no brainer - save time and money By crackischeaper on 6/18/2014crackischeaper would recommend this product to a friend-Save money by buying your media in larger quantity and fill all your cartridges at once.
-Cut your maintenance time in half by having one of these (or more) ready to swap out as needed.