Rhamp Posted September 30, 2017 Share Posted September 30, 2017 I'm wondering if an underground filter is enough for a 4 foot tank that I gravel vac 60 litres of water out once a week Link to comment Share on other sites More sharing options...
Ageofaquariums Posted October 2, 2017 Share Posted October 2, 2017 Could always stress test it by feeding the amount you intend to feed and ensuring no ammonia/nitrite is building up. They are not very good for mechanical filtration, but if you are that keen on the gravel vacs thats not really an issue. Link to comment Share on other sites More sharing options...
Rod54 Posted October 3, 2017 Share Posted October 3, 2017 Has anyone tried a reverse underground filter? Power head to push water to underside of gravel, then up through gravel.....waste then gets trapped under the bottom of the gravel Each time you do a water change connect to U/G filter inlet and water is drawn through gravel from top to bottom Trapped waste is then removed.... This is opposite to normal U/G filter but saves gravel vac??? Link to comment Share on other sites More sharing options...
Ageofaquariums Posted October 4, 2017 Share Posted October 4, 2017 This helps, but if speed of cleaning and mulm removal is the result desired then air powered sponge filters are way easier and more effective. Its only the aesthetics that UGF has the advantage in. Although when you use a powerhead on a UGF the aesthetics take a huge hit anyway. Also,if the idea is to blow mulm around rather than suck it into gravel..... water clarity takes a hit too. Link to comment Share on other sites More sharing options...
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