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Old 09-12-2011, 07:33 PM   #1
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What does a wet/dry filter do?

I have been looking at filters, and some of them have wet/dry filters. I was wondering what they do, and what the benefits of them are. Thank you
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Old 09-13-2011, 12:11 AM   #2
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Old 09-13-2011, 12:49 AM   #3
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Wet dry filters combine water and air on their surfaces to increase the amount of oxygen for the good bacteria by a very large factor.
They do this in various innovative ways, such as rotating wheels built into a power filter, or multiple-faceted balls piled high in a sump, some above the water line with the water dripping over them into submerged balls...all covered with bacteria.
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Old 09-13-2011, 01:54 AM   #4
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i love how basically every thing about wet dry filters revolves around nitrate factories. it was a study that was released then RETRACTED yet noone looks at that. in a probably maintained system a wet dry filter is the best.
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Old 09-13-2011, 02:11 AM   #5
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with poor maintenance, ALL filter media can become nitrate factories.

Loweing nitrate levels can be achieved with understocking, routine filter and gravel cleaning and water changes.
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Old 09-13-2011, 02:18 AM   #6
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exactly. lol i just dont understand why its forced on wet dry so much.
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Old 09-13-2011, 10:48 AM   #7
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Hang on... My basic understanding of bio-filtration is as follows:

Ammonia -> Nitrites -> Nitrates

In all circumstances... Surely all biological filters are "nitrate factories"? That's the point of them?
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Old 09-13-2011, 11:19 AM   #8
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Quote:
Originally Posted by The Editor
Hang on... My basic understanding of bio-filtration is as follows:

Ammonia -> Nitrites -> Nitrates

In all circumstances... Surely all biological filters are "nitrate factories"? That's the point of them?
Massive biomedia capacity is the selling point for me.
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Old 09-13-2011, 11:52 AM   #9
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Quote:
Originally Posted by The Editor
Hang on... My basic understanding of bio-filtration is as follows:

Ammonia -> Nitrites -> Nitrates

In all circumstances... Surely all biological filters are "nitrate factories"? That's the point of them?
Not all biological filters are nitrate factories. Mud beds or deep sand beds are just the opposite. The bacteria that consume nitrates are araerobic and do not like to oxygenated, and prefer to live deep in mud or sand beds. That's why many in the aquarium hobby, both freshwater and salt, are adding refugiums to their systems. Other than my sons little 20 gallon freshwater (which has a marineland emperor 400 bio wheel), I have mud beds in all my tanks including freshwater. Much better than wet dry in my opinion, which have always been nitrate factories for me.
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Old 09-13-2011, 12:48 PM   #10
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Not all biological filters are nitrate factories. Mud beds or deep sand beds are just the opposite. The bacteria that consume nitrates are araerobic and do not like to oxygenated, and prefer to live deep in mud or sand beds. That's why many in the aquarium hobby, both freshwater and salt, are adding refugiums to their systems. Other than my sons little 20 gallon freshwater (which has a marineland emperor 400 bio wheel), I have mud beds in all my tanks including freshwater. Much better than wet dry in my opinion, which have always been nitrate factories for me.
Ah ok.. Granted I'd completely forgotten about anaerobic bacteria

But the anaerobic bacteria that live in the deep mud/sand beds still require the presence of Nitrates in the water column for them to digest them into nitrogen. So the Ammonia -> nitrite -> nitrate step must still occur at some point or time in the bio-filtration media?

My main question is how is a "nitrate factory" different to any aerobic biofilter that converts the ammonia to nitrates?
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