Sump/External filter

riskybiscuits

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Hi

Can someone please explain the difference between a sump and an external filter? Which should be used and when?

Thanks!
 

MomeWrath

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Sumps are more commonly used on saltwater systems, because a Saltwater tank will usually require a protein skimmer, which usually needs to be placed in a sump to work. You can install a canister on just about any aquarium. A sump needs an overflow of some kind - there are hang-on overflow boxes but they can be a little scary to set up for a beginner. Sumps are best on tank that has a built-in overflow and has already been plumbed for that use. A sump is a great place for filtration because it has a huge amount of volume that can be filled with whatever media your heart desires, but in itself is not a filter.
 

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