The Planted Tank Forum - View Single Post - Closed Loop filtration and pump placement
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Old 11-24-2012, 02:29 AM   #9
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{Push Flow} Pressure type aquarium pumps handle back pressure better and can be used for almost any application. Especially recommended for high-head situations or when using cartridge (pressure) filters like Nu-Clear and Red Seas canister filter.

{Pull Flow} Non-Pressure type aquarium pumps are best suited for circulation only - that is, where water encounters very little back pressure--for example, returning water from a sump. Excellent where a high turn-over rate is desired like wet-dry and sumps.
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