running 2 filters in parallel.

DarkSoul

DarkSoul

Mad Scientist
Mar 12, 2007
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London, Ontario
I want to run 2 eheim 2213's on my 50 gallon tank, and im wondering what effect it has on head, and flow of the water if i were to run both of the filters on one intake, and one outlet.


the intake would be Tee'd off, and the outlets would be connected with a Y fitting, due to how they are positioned on the filter.

anyway im just wondering how two pumps perform together when connected in that way.

Thanks.
 
I think it would be best to run them independently. You will probably affect their capacity unless you increase the size of the inlet and outlet tubing, making them compete with one another.
 
yes, i would be increasing the size of the inlet and output tube.

My current eheim 2213 is using the installation kit 1 and 2 from another model of filter.
They are much larger, and require 5/8" tubing. so i will run 5/8" ID tubing to the elbows and reduce it to the 1/2" tube that the filters use at there inlet and output. the reduction would be as close to the filters as possible.

The main reason im asking, is because my filter placement right now is a bit more than 4' away, as far as tubing length is concerned, but the actual lift would be no more than about 2' .

most of the run is flat and horizontal.
 
If your current filters have 1/2" ID tubing on inlet and outlet, you will need 3/4" tubing if both are drawing or discharging to a single piece of pipe.
 
the filters can only take in as much water as will fit through the smallest diameter of your plumbing. you could have 1" tubing, but you're only going to get the max flow of 1/2" if that is the size you use on your intake.
 
Maybe I stated it poorly. I just wanted him to understand the need to use bigger tubing to supply the two filters than normal, and the same on the discharge.
 
rbishop said:
Maybe I stated it poorly. I just wanted him to understand the need to use bigger tubing to supply the two filters than normal, and the same on the discharge.
Click to expand...


Right, the 1/2" connection from the filters, would be Tee'd off close to the filter, and would be drawn through a single 3/4" tube (I may have to go with 5/8", it shouldnt slow things down too much)

Each filter is only gonna pull as much water as its rated, and this is going to happen in the short pieces of 1/2", the flow of water would remain the same with larger single tubing.

In other words, i dont think it would reduce the water flow much if at all, im just wondering if running the two filters like this would double the lift... IE one filter, has 4' head, so if i run two of them in parallel, would that give me 8' of head?
 
I'd have to go check my reference material, which I'll do, but my first thought would be no. Each pump is pumping the same amount as before thus capable of the same work as before. You are just combining their output into one larger pipe.
 
and thus my problem.... sort of.

The only place i can put my filter(s) are on the oppisite side of my tank from where the inlet and spraybar are located. which is about 3' away along a horizontal plane (which would really not require any "lift" perse), and probably about 3' up.
So all in all, the water would have to travel through about 6' of tubing to reach the spray bar.

too much head, and i still reduce the flow of the filters.
 
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