![]() ![]() If one can get five years out of most canisters and HOBs, you are doing well. I have been using some under-gravel filters for some thirty years and they are still working well. Air operated under gravels have no moving parts that need replacing. Most shops do not promote them because it is a onetime low profit purchase with no return business. Note the brightest, most honest fish keeper in the business, Cory of Aquarium Co-op, recommends under gravel filters. Under gravel filters are still one of the best forms of filtration out there. None of these points withstands scientific scrutiny. ![]() So one is left with common sense and anecdotal “testing” as the only sources of information in the analysis below.Īquarium equipment manufacturers and fish stores who want to sell expensive canister filters (ah, the profit motive at work!) have invented a whole host of negative points about under-gravel filters. Undergravel filters have not been widely tested as a filter in the aquaculture industry, The limited testing done on gravel filters for aquaculture was “all over the map” due to the very high loading of commercial operations. ![]()
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