ryanjury Posted September 12, 2007 Report Share Posted September 12, 2007 Id buy the biggest and best one I could afford you will never regret buying a big filter you can diffuse the flow by turning the spraybar into the glass etc.. A CF1200 would be flowing alot less with media and operating at a head height etc anyway.. Quote Link to comment Share on other sites More sharing options...
michael.qian Posted September 12, 2007 Author Report Share Posted September 12, 2007 A CF1200 would be flowing alot less with media and operating at a head height etc anyway.. Sorry not sure what you mean by this? I can pick up a new CF1200 for the price I bought this Eheim for, what's the reliability of Aqua One filters like? Anyone want to share any experience? cheers Quote Link to comment Share on other sites More sharing options...
ryanjury Posted September 12, 2007 Report Share Posted September 12, 2007 I haven't had any problems with them.. A filters flow rate (ie 1200LPH) is given with no media in it and also no pipes connected, once you put media in, stick the filter on the ground connect it all up the vertical height from the filter to the tank is the head height (the height the filter has to pump the water up). All of these things slow the stated filter flow rate down.. Quote Link to comment Share on other sites More sharing options...
michael.qian Posted September 12, 2007 Author Report Share Posted September 12, 2007 oh right. so with any filter, the actual flow rate it produces once all set up, is lower than the given flow rate. When I get my refund for the Eheim I might go for a new CF1200. Quote Link to comment Share on other sites More sharing options...
Aquarium Dude Posted September 12, 2007 Report Share Posted September 12, 2007 Ive got an aqua one cf2200 its kind of hard to get apart for cleaning, but you only need patience to fix that, otherwise its been running fine for over 6 months. Ps. I dont know about the smaller cf1200 etc Quote Link to comment Share on other sites More sharing options...
evilknieval69 Posted September 12, 2007 Report Share Posted September 12, 2007 Ryan you are tad wrong there. External filter have NO head height operating on them at all, because the water enters and exits at the same height (tank water level) So the pressure pushing the water down the tube (the siphon) is pushing it up the other side aswell. However, if you had a sump setup and used an external filter to suck the water from the sump, and blow it out in the tank above, you would get a very slow rate as that is not what a filter of that type is designed for. The filter will die prematurely too. A 1200LPH filter is just that. If you hook it up to your tank, WITH NO MEDIA OR TRAYS it will pump 1200LPH of water (or there abouts). Once you put the media into the trays and into the canister, the flow rate significantly drops. HTH Quote Link to comment Share on other sites More sharing options...
Ira Posted September 12, 2007 Report Share Posted September 12, 2007 They'll probably pump 1200lph with no intake piping and a tailwind while being chased by a marketing guy with a knife... I tested a couple of my fluval 404s once, they're rated at about 1200lph. With no media or anything and no head height they were pumping ranging from 600-900 LPH. An eheim might be a bit better that. Quote Link to comment Share on other sites More sharing options...
ryanjury Posted September 12, 2007 Report Share Posted September 12, 2007 So how high up the tank is has no affect at all because the pressure of the syphon has the same affect? I didn't think of it that way, have tried to use a spare external to pump to pump water for water changes and it doesn't like it very much at all! Quote Link to comment Share on other sites More sharing options...
Ira Posted September 12, 2007 Report Share Posted September 12, 2007 So how high up the tank is has no affect at all because the pressure of the syphon has the same affect? I didn't think of it that way, have tried to use a spare external to pump to pump water for water changes and it doesn't like it very much at all! That's right. Well, a little bit due to frictional losses in the longer hoses for a taller tank, but that's not huge anyway. Quote Link to comment Share on other sites More sharing options...
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