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 | Canister Flow Rates |
Alex   Fish Addict 510 Posts: 721 Registered: 03-Oct-2004   | Eheim Classic 2250 width 355mm flow rate 1000lph Eheim Classic 2260 width 355mm flow rate 2400lph say there are 10 ''bio bits'' in every cm of height. we know they hold the same amount of biobits per cm of height due to the circumference being the same. the flow rate through the 10 ''bio bits'' in the 2260 is higher then the flow rate going through the 10 ''bio bits'' going through the 2250 anyone have any idea why? pretty stupid question but it could raise some interesting discussion. |
 Posted 13-Jan-2008 12:58 |      |
FRANK      Moderator Posts: 5108 Kudos: 5263 Votes: 1690 Registered: 28-Dec-2002   |  Edited by FRANKI'm assuming that either the pump itself, or the motor, or both is stronger in the 2260 than the one in the 2250. Small changes in the style of the pump (shape of the impeller for instance), or even the size of the wire with which the armature of the pump is constructed, can account for the differences in output despite the sizes of the filter and various compartments remaining the same size. Frank  -->>> The Confidence of Amateurs, is the Envy of Professionals <<<-- |
| Posted 13-Jan-2008 18:07 |  |
| Alex Fish Addict 510 Posts: 721 Registered: 03-Oct-2004 | no im saying why did they make it so that the water is flowing faster through the 2260s media? Is the higher flowrate better at utilizing the media? Is the higher flowrate to ensure a more even distribution of water movement through the taller canister? If so then why would eheim which 90% of the regulars on this site recommend have really low flow rates compared to other canisters when they use very similar media and have a similar design? |
| Posted 14-Jan-2008 06:47 | |
keithgh   *Ultimate Fish Guru* Posts: 6371 Kudos: 6918 Votes: 1542 Registered: 26-Apr-2003  | If so then why would eheim which 90% of the regulars on this site recommend have really low flow rates compared to other canisters when they use very similar media and have a similar design? What I understand about Eheim is the flow rate is slower because it goes through a different medium and also it/is a larger total surface area it flows through. Just at a guess if you took all the media out you might find the flow rate would increase also if you packed it tightly of filter wool it would be a lot slower. I hope this makes sense to you. Have a look in [link=My Profile] http://www.fishprofiles.com/forums/member.aspx?id=1935[/link] for my tank info Look here for my Betta 11Gal Desktop & Placidity 5ft Community Tank Photos Keith  Near enough is not good enough, therefore good enough is not near enough, and only your best will do. I VOTE DO YOU if not WHY NOT?  VOTE NOW VOTE NOW |
| Posted 14-Jan-2008 07:04 | |
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