Galabar Posted May 13 Share Posted May 13 I've been looking into the efficiency of undergravel filters lately. It's very "old school," but seems to have a lot of advantages. In my reef keeping days, I used a very deep sand bed as a sump (18 inches). I was able to remove my protein skimmer and have no detectable nitrates. Now, we don't shoot for anaerobic conditions for freshwater. However, the external nature of the deep sand bed got me thinking. What about a rubermaid sump, with some PVC piping and uplift tube, powered by a bump at the top. Water flows down from the main tank into the sump, and the bump bulls from the PVC piping and returns it to the tank. The piping is covered with 2" of pea gravel, followed by 8" of sand, and another 2" of pea gravel. That would give a huge surface area for ammonia-to-nitrate filtration. The pea gravel at the top allows detritus to quickly sink down from the surface. Thoughts? Link to comment Share on other sites More sharing options...
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