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One of the most frequently asked questions in the reef aquarium hobby is "What is a sump?" Much of this confusion stems from the synonymous use of the words sump, wet/dry filter and refugium. Technically all three are sumps by definition, which simply means a reservoir or container of water. Check out this diagram to find out the differences and similarities of sumps, refugiums and wet/dry filters.

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75 Gal w/ DIY Custom Stand and DIY Sump/Refugium - low tech aquarium More

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