Canister filter -dirtiness entrance tube

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bogart

Aquarium Advice Regular
Joined
Feb 24, 2014
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Bloomfield Hills
Can someone explain the purpose of a dirtiness entrance tube on a canister filter? It's an attachment to the intake tube with a round cylinder that floats on the top of the water.
 
Can someone explain the purpose of a dirtiness entrance tube on a canister filter? It's an attachment to the intake tube with a round cylinder that floats on the top of the water.

If you're talking something like that:
surface-skimmer-aquariums-up-to-50-gallons.jpg


That's a surface skimmer, it remove the oily film of the water surface and promote surface agitation (aeration).
 
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