Dophin filter rate

Good day all I recently added a larger Dophin C500 to my 60L tank. On the box it claims to have a 1130LPH pump yet out of curiosity I tested the pump by time it how long it took to fill up a 2L jug (26,79s) therefore it does approximately 4,4 LPM and 264LPH has anyone else encountered this problem? Could my impeller need replacing seeing as I bought it second hand? I have so many questions


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Did you open up the pump head unit and clean it out? All the kunk builds up in there.

Is the rubber seal ring on the baskets tube?

Does it make any noise? Rattling...

Is it purged of all air?

 

Most cannisters are rated judged by having no media in the baskets. Conduct your test again without any media in there and then see if you have a closer reading.

If not all of this should be considered next

 

I did redo it and only got 100LPH more it’s very disappointing


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Maybe try vaseline on the impeller. But honestly I'm not sure you can get it anywhere close to what it's rated

 

Hi Carl, Sorry I have only seen this thread now. I can assure you that the equipment is in almost new condition. Just a quick one, How did you measure the flow rate? Did you have pipes connected to the filter at a certain height? There are many factors involved in calculating the flow rate including the diameter of the in and out flow pipes. One thing to keep in mind is the higher the pump has to pump water in a given diameter tube the more weight of water there will be. A pump can only lift a certain weight of water before the force of that weight of water pushing down (under gravity) equals the force the pump pushing up.
See if you can repeat the exercise again but this time using a larger volume of water (5lt or more) also try do it after the pump has been running for a while to eliminate any air trapped inside.
It would be interesting to hear the results.

 

Oh no problem I’m sure it’s probably gunk build up and the filter is cycling my tank just fine I just found it interesting. I will repeat the test with a 25L buck and see the results. I just thought I’d conduct a scientific investigation


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Yeah, It does sound a bit weird. I did some reading on the Eheim filters and apparently they do the same thing. Makes you wonder how the manufacturers are allowed to advertise with claimed figures.
The only reason i can think of is the actual pump is rated at that. (Not installed in the filter housing)

 

Yeah a lot of the ratings are tested with short hoses and empty filter baskets so you never actually get that


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