Thread: DIY Biodenitrator
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Old 09-18-2008, 01:14 PM
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Default Re: DIY Biodenitrator
Thats called a Plenum. Been around for decades. Its an UnderGravelFilter with a twist. Instead of using Airlifts you're using a pump to pull water through the sand. Google Plenum and you will see all sorts of designs for it.
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