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Thread: Tank length question

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    SCAPE Member SCAPEr cjbart1009's Avatar
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    Tank length question

    What’s the longest length I can have a tank to provide good enough flow with the eheim pro 4+ 600?

    I currently have it in my 40” long tank and I have it reduced to half the flow. Can I do 5’ long by 20” wide with just this filter and still provide adequate flow?


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    SCAPE Member Pro SCAPEr Nick Shades's Avatar
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    It has a head lift of almost 6 feet.
    Depending on how much length you are bringing it up from the ground to get back into the tank, the general rule of thumb is that horizontal length removes head lift at a ratio of 3 to 1, and tank discharge diffusion is approximately 2 to 1.

    So if you have a 5 foot tank, your diffusion is 10` at 0 lift.

    If you have 3 feet of lift, your diffusion on a five foot tank remains at 1 foot diffusion remaining.

  3. #3
    SCAPE Member SCAPEr cjbart1009's Avatar
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    Quote Originally Posted by Nick Shades View Post
    It has a head lift of almost 6 feet.
    Depending on how much length you are bringing it up from the ground to get back into the tank, the general rule of thumb is that horizontal length removes head lift at a ratio of 3 to 1, and tank discharge diffusion is approximately 2 to 1.

    So if you have a 5 foot tank, your diffusion is 10` at 0 lift.

    If you have 3 feet of lift, your diffusion on a five foot tank remains at 1 foot diffusion remaining.
    Can this be translated to not so advanced aquarist?


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    Water is Life 5000 posts, Officially addicted to SCAPE! Zenzu's Avatar
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    Quote Originally Posted by cjbart1009 View Post
    Can this be translated to not so advanced aquarist?


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    Head lift is a rating for your pump which essentially equates to output pressure.

    Your pump is rated for 6ft of head lift.

    Tank discharge is 2 to 1 meaning... every 2 ft of tank length = 1 foot of head lift.

    6ft rating at 0ft of head lift = 12ft tank length (2 to 1 ratio)

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    Water is Life 5000 posts, Officially addicted to SCAPE! Zenzu's Avatar
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    Another example is your canister is rated at 6ft head lift...

    if your 16" tank is on a 32" tall stand that equals 48" total height or 4 ft of lift needed.

    Remaining head lift 2ft at a 2 to 1 ratio you can cover a 4ft tank. 2 x 2 = 4ft length

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    SCAPE Member SCAPEr Electric's Avatar
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    Nick and Carlo that was very helpful, I never looked that deep into output pressure ratings necessary for a tank. Probably always covered by the unnecessary overkill that plagues many of us in the hobby.

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