Canister on table top? - The Planted Tank Forum
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post #1 of 14 (permalink) Old 11-01-2019, 05:03 AM Thread Starter
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Canister on table top?

Wondering if a canister filter will work/be fine as long as the top of the canister is below the water level in the tank. My canister is 15" tall and the water level in the tank is about 4" above that.

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post #2 of 14 (permalink) Old 11-01-2019, 06:05 AM
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Should be depending on the filter. Most say to be below the water line.

I would think you can still prime it being below water line, its when you get above that you run into issues.


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post #3 of 14 (permalink) Old 11-01-2019, 11:49 AM
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Here is a picture of my quarantine tank. This picture is a little old but I've been running this tank for the last 2 months without any issue. Its my first canister filter so I never even considered not doing it this way, didn't know I wasn't supposed to till now. It was admittedly annoying to prime, I have no idea if that was just me though or if that was the position of the filter. Anyway, it works fine and once primed it has not been an issue. During water change I unplug it and plug it back in when complete. Never an issue.

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post #4 of 14 (permalink) Old 11-03-2019, 01:15 AM
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As long as the system is primed/purged, it doesn't matter where it is in relation to the water level.


PS. I love the hangers on that light, it looks like some of my own handiwork.
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post #5 of 14 (permalink) Old 11-03-2019, 09:08 PM
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Originally Posted by mossman77 View Post
Wondering if a canister filter will work/be fine as long as the top of the canister is below the water level in the tank. My canister is 15" tall and the water level in the tank is about 4" above that.
My Eheim 2217 says that the top of the filter needs to be a bit below the water line. I can't find my manual to find the exact amount. The plus is that you should get a bit better flow than if you had it on the floor.

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post #6 of 14 (permalink) Old 11-04-2019, 10:01 PM Thread Starter
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As long as the system is primed/purged, it doesn't matter where it is in relation to the water level.


PS. I love the hangers on that light, it looks like some of my own handiwork.

Right, but the issue is priming the system after a water change and after losing a siphon when the tank water level is considerably lower than the top of the canister.

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post #7 of 14 (permalink) Old 11-05-2019, 01:01 AM
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Right, but the issue is priming the system after a water change and after losing a siphon when the tank water level is considerably lower than the top of the canister.
Mine has the little pump on the top to manually prime. That said, you could always temporarily lower it by putting it on a chair or something, then once started put it on the table top. /shrug
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post #8 of 14 (permalink) Old 11-05-2019, 01:27 AM
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Can confirm that it doesn't matter where the canister is located. It may make it more annoying to prime as mentioned. It works on the same concept as hang on tank overflows. Displacing the liquid causes fluid to be drawn in behind it. Your canister should be a sealed system, it'll work just fine.


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post #9 of 14 (permalink) Old 11-06-2019, 06:54 PM Thread Starter
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The canister would be located in a corner behind the tank, so lowering it to prime probably isn't an option.

What about overworking the impeller? I thought this was another reason for keeping the canister below tank level.

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post #10 of 14 (permalink) Old 11-06-2019, 09:02 PM
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Canisters are unique because they're a closed loop system as long as both intake and output are under the waterline. Unlike sumps, canisters don't have the same issue fighting head pressure because one side pushes equal to the other side's pull. I'd think being higher would put less stress on things? or at least less pressure on seals... The big issue is priming/burping air but as long as it's lower than the tank it will, just may take longer. Buuut in the corner behind the tank may not be ideal for giving the canister good thorough cleanings, unless you can easily lift it up and over on maintenance days

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post #11 of 14 (permalink) Old 11-06-2019, 09:47 PM
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BTW, Great to see you back @Freemananana!
Thanks

Head pressure should be less with the canister around water level compared to below water level. So the impeller/motor/whatever should work less. At least, that is my thought.


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post #12 of 14 (permalink) Old 11-06-2019, 10:08 PM
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Thanks

Head pressure should be less with the canister around water level compared to below water level. So the impeller/motor/whatever should work less. At least, that is my thought.
That's what I thought also, which is why I'm considering raising my filter so that the outlet port is near water level.

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post #13 of 14 (permalink) Old 11-07-2019, 12:34 AM
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As long as its not cavitating it will have less pressure on the outlet so should theoretically last longer. Cavitation or in our case more trying to push air/water mix is going to be rough on them.


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post #14 of 14 (permalink) Old 11-12-2019, 04:20 PM Thread Starter
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Buuut in the corner behind the tank may not be ideal for giving the canister good thorough cleanings, unless you can easily lift it up and over on maintenance days
Yes, I can reach the corner and lift the canister up and over for maintenance if I use a step stool/chair, so no worries there.

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