I recently replaced a K2R down flow with a GEO up flow, they both use the same Eheim pump for recirculation and are fed off the main pump return. I like the large media (it seems to be lasting longer) and the recirc CO2 design keeps any bubbles from collecting in the media chamber.
Probably my favorite feature is the auto-fill on the bubble counter but that's probably not exclusive to up flow.
It does seem easier to over pressure (enough to blow out a uniseal) than the old one but now with two gate valves (1" and 1/2") on the feed it's easy to control.
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Brian
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220g inwall 48"x36"x30"
110g mangrove refug/sump
Poison Dart Frog Vivarium
Last edited by Pescador; 04-18-2008 at 12:13 AM.
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