<https://forum.aquariumcoop.com/topic/12409-why-are-ugfs-not-very-popular/#comment-97204>
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"Here is how I see this.\n \n\n\n\tUGFs are not a recurring income product.  They have no filter to replace, no media to replace, etc.  There is no reason someone using a UGF will contact Marieland for a replacement O ring link I current am required to purchase to revive my magnum 350.  \n\tBesides never really knowing what is under them @Ken D., which I can help fix,  I can not think of any Cons, that I can not fix. \n\tUnless you buy a cheap one that breaks easy.  Lee's are super and not cheap, @Beardedbillygoat1975  stated above that they are robust.  Very true.  I have broken many CHEAP UGF building with rocks my cichlids could not move around.  LEE's, while I will not stand on them, I bet my 13 year old son could stand on them.\n \n\n\n\t \n "
<https://forum.aquariumcoop.com/topic/12409-why-are-ugfs-not-very-popular/>