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People consider them obsolete. Under gravel filtration is an old technology, and seems to be going out of favor for newer types of filters, to the point where under gravel filtration has become a point of controversy among people who keep aquariums, with many arguing that they should no longer be used at all. The arguments against them seem to boil down to: ...


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Under gravel are cheap so the dealers have made them "politically undesirable". I expect in fresh water , depending on fish density, type, and food ,etc, the gravel may need to be cleaned . I found them to be great for salt . With aragonite/crushed coral/limestone gravel the water flowing down through the gravel picks up calcium which is necessary ...


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