koiguyoz
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Aug 15, 2005, 9:07 PM
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Re: [perplex] Submersible biomedia?
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I did this when I first started.
The biggest problem you'll find is trying to clean all the poop and stuff that gets sucked into that filter box. I can tell you its a wet, stinky and cold affair to be getting into. All in all what you have described is usually called "submersible biofilters".
From what I've been done and read the bacteria responsible for converting ammonia requires quite an amount of oxygen. Deep in the water, these bugs won't be able to have such an abudant source.
In a similar vain, the system you describe may also resemble an undergravel filter (UGF) used on some aquarium systems. To use this on a pond would require a higher amount of maintanence than an external prefilter/biofilter combination.
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Re: [perplex] Submersible biomedia?
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. Bio media won't clean itself and needs a pre-filter which must be cleaned regularly in order to function properly. I'd try looking for a completely different solution if I was in your shoes 'cause this approach has some very messy and labor intensive drawbacks, just like koiguyoz said. 
i just thought that the water contact (and air) would be sufficient. so debris would cover the biomedia and stop the bacteria functioning right? 
. I don't know what type of setup you have, but a multi chamber (at least 3) filter system is about the minimum you can get by with. 