One is metal… one is plastic… u want the plastic. Used to be very common yrs ago and they were dirt cheap. These days its around the same price as buying regular bio balls in bulk. I would suggest against the metal. They will most likely rust and break down over timeThen how is the above different from this one
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7.2.8. Pot Scrubbers - Aquarium Science
Pot scrubbers have the best combination of biofiltration capability, ease of use and availability of any biomedia. Extensive testing has shown it to be a very good media to put in an aquarium filter. If one is a nerd like the author one might be interested in this long boring article on why this isaquariumscience.org
Then how is the above different from this one
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7.2.8. Pot Scrubbers - Aquarium Science
Pot scrubbers have the best combination of biofiltration capability, ease of use and availability of any biomedia. Extensive testing has shown it to be a very good media to put in an aquarium filter. If one is a nerd like the author one might be interested in this long boring article on why this isaquariumscience.org