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Title: low-cost, but does not last long
Review: This multipack is significantly cheaper than the 3-pack reptofilter that's sold (also by Tetra) in the green box. However I've noticed that each change-out does not last as long as the filters from the green box. I don't know if it's a different grade of carbon, or if each bag does not contain as much carbon, but the lifetime of each filter is only about half of what i get out of the green box filters.With this said, it's still cheaper than the green box filters even if you have to change them out twice as much. HOwever it's just more of a hassle
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