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Thread: Cor-20 audible hum in systems- plumbing?

  1. #1
    New User
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    Cor-20 audible hum in systems- plumbing?

    so i plumbed my cor20 starting with 1.25" plumbing reduced about 8-9" later to .75" as that what my tank is plumbed for. the tank has a loud(ish) hum coming from the area of the reducer. i never tried the pump out before so im not sure if this is the quiet pump sound i see written about on forums or my pump is loud due to plumbing.

    tank is a 100g INT tank, i have 3 elbows and a ball valve, tops 2.5' of plumbing on the return. i have the pump running 100% and seems like very little flow is going through my sump. overflow is bean setup rated for 1000GPH.


    should i just take out the section of 1.25" plumbing and make it all .75?
    IMG_3936.jpg

  2. #2
    Frequent Contributor zombie's Avatar
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    Dec 2013
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    Yes. That 1.25 is so short anything it buys you in reduced friction losses is cancelled out by the minor loss of the reducer.

    Sent from my SM-G965U using Tapatalk

  3. #3
    New User
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    Auburn, WA
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    I have the INT 112 and was just at this same question. What were the results?

  4. #4
    Regular Vistor
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    Mar 2018
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    netherlands
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    16
    try to loose all of the elbow's in the line also and use a silicone hose for the connection to the pump

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