Powerheads

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A normal filter provides mechanical, chemical, and biological filtration as well as providing some current. Some powerheads have a sponge to provide some mechanical filtration but are just typically used to provide current.
 
yeah powerheads are for circulation of the water, and so are good for SW tanks, whereas a filter is to clean the water of impurities
 
It depends on how you use the powerhead, you can fill a intake tube up with media utilizing chemical filtration, the sponge on there for mechanical filtration and then the gravel itself for biological.

I use RUGF's and use powerheads alot, just picked up 3 dozen more, some work some dont but for 10 bucks Im not complaining.

What are you thinking or using it on now?

Every tank of mine has a Powerhead in them now and the water has never been cleaner.
 
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