Do canister filters lose flow with head?

[fhawk362]

I was thinking, do canisters lose flow depending on how far below they are? Lets say I have a marineland 350 (350gph) and it's 3 feet below the tank, would its flow actually be around 200gph? What about hob's, I couldnt see them losing flow though because of how its set up.

 

[mgk]

I was thinking, do canisters lose flow depending on how far below they are? Lets say I have a marineland 350 (350gph) and it's 3 feet below the tank, would its flow actually be around 200gph? What about hob's, I couldnt see them losing flow though because of how its set up.

yes its called head loss.

also the rating is probably without media in the filter.

 

[erk419]

Intersting question I'd like to see what others have to say about this. I can see why it could be possible though if the outtake was lower it would have more water to push through I'm not sure if there would be more pressure lower or not.

 

[erk419]

I was thinking, do canisters lose flow depending on how far below they are? Lets say I have a marineland 350 (350gph) and it's 3 feet below the tank, would its flow actually be around 200gph? What about hob's, I couldnt see them losing flow though because of how its set up.

So the lower the outtake the lower the flow coming out?

 

[fhawk362]

So the lower the outtake the lower the flow coming out?

Yea like with sump pumps people always say if you want 600gph then go with about a 900-1000gph flow pump. So if this were the same with canisters than an fx5 would actually be like 600gph at the 5ft head.

 

[mgk]

Yea like with sump pumps people always say if you want 600gph then go with about a 900-1000gph flow pump. So if this were the same with canisters than an fx5 would actually be like 600gph at the 5ft head.

its around that normally, theres no way any of those canisters pump there max flow rate.


In the fluval video, they tell you to have a certain length hose on it and if you exceed that recommendation it might not work.

 

[erk419]

Yea like with sump pumps people always say if you want 600gph then go with about a 900-1000gph flow pump. So if this were the same with canisters than an fx5 would actually be like 600gph at the 5ft head.

What do you mean when you said "at the 5ft head" when you were talking about the fx5?

 

[fhawk362]

like 5ft of hose leading to the tank which cuts down flow rate

 

[Fishermoe14]

id have to disagree...

if you fill a tube up with water and put each end in the tank there is no flow in or out.. meaning there is no actual work being done on the water from gravity..

a canister is just a large tube with a pump..

keeping it in a vacuumed state would allow for the water level in the outflow tube to sit at the tank's water level with everything turned off.. try with a sump and you see that all the water in the tube goes straight down into the sump ( as it should )

 

[erk419]

like 5ft of hose leading to the tank which cuts down flow rate

Oh ok thanks for explaining that!