Restricted flow on filter - The Planted Tank Forum
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post #1 of 6 (permalink) Old 07-09-2018, 12:39 AM Thread Starter
Algae Grower
 
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Restricted flow on filter

The tubes for my Eheim canister filter crimp slightly in certain places which restricts the flow of water. Are there any solutions to prevent this from happening? I'm sure I can't be the only one to experience this issue? How do you keep the tubes fully open and not bending in any areas?
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post #2 of 6 (permalink) Old 07-09-2018, 01:00 AM
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On one tank I stepped up to 3/4"(19mm) tubbing which is very stiff and doesn't crimp, and on another I swapped the tubbing out with PVC. Anyway you do it you're always going to have some residual loss of flow which is why I've joined the ranks of the 10x filter club.
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post #3 of 6 (permalink) Old 07-09-2018, 11:44 AM
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I have not used eheim brand hoses or filters however with clear vinyl (and green for that matter) I have solved it 2 ways:
1. Most effective, replace with a hose that's not kinked to begin with.
2. Do at your own risk of personal and pet safety: Place the kink in very hot water and manipulate the bend or in extreme cases blow in the hose to expand the kink. Be careful, there is much room for error and self inflicted wounds with this method.

Another method, you could cut out the kink and put in a hose splice with clamps.
GL
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post #4 of 6 (permalink) Old 07-09-2018, 02:45 PM
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Hard to say what is needed in any specific setup without seeing the layout but there may be some general help. One is cutting the tubing to avoid kinks! sounds pretty simple but there are times when we shoot ourself by avoiding cutting.
Using the Eheim stock tubing can get better results than that found at many hardwares as it is designed to not kink.
But if those fail, adding fittings can cut the kinking but at the expense of some loss of flow due to the fittings themselves. When we add a fitting inside a tube, we automatically reduce the inside opening and that reduces flow.
I find arranging large sweeping curves to work better when I do not want to cut or add fittings. In some cases, I know I will be moving this filter to a spot where I want longer tubing so I keep the long stuff from kinking by strapping it in a curve.
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post #5 of 6 (permalink) Old 07-09-2018, 03:14 PM
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Post the filter model and if you can, a pic of the where/how the hoses are crimped.

Most times the crimp/kink is where the hoses come over the rim of the tank.

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post #6 of 6 (permalink) Old 07-09-2018, 11:55 PM
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Eheim makes a rigid elbow connector to prevent kinks.

https://www.amazon.com/Eheim-Elbow-C.../dp/B0002DGZRC
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