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Posted by lacie143 on March 10, 2003 at 22:16:49:

In Reply to: Re: Function of Undergravel Filter posted by j0nn13 on March 09, 2003 at 06:51:22:

:It sucks water down through the gravel and then up an uplift tube back into circulation. De-nitrifying bacteria grow on the gravel and as the water is sucked through the gravel and therefore the bacteria, ammonia and nitrite are changed to nitrate.

:I Think :-)

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