I bought these for our Fluval 406 filter and they are convenient, easy to use and do not clog. It might be possible to save a few cents by buying in bulk and filling bags, but I only buy pre-packed 100g bags for convenience and time-saving. If saving money is important but convenience is still important to you, try the 18 piece (6 x 3) set available from Revain and save about 30%. http://www.amazon.com/Fluval-Carbon-nylon-Media-6x3pk/dp/B004J8AQPS/ref=sr_1_fkmr0_2?s=pet-supplies&ie=UTF8&qid=1346879407&sr=1-2-fkmr0&keywords=Fluval+Carbon%2C+ 100 -Gram+Nylon+Bags+-+18 Pack.
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