Return box with no siphon break

Discussion in 'Anything DIY Related' started by RiaanP, 12 Jul 2015.

  1. RiaanP

    RiaanP Moderator

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    I decided to create a thread on just my return box. Had another member asked me over the weekend.

    Basically it is a slimline overflow. You can have the box all the way to the bottom. Or as a small short box.

    The secret is to mount it, with the "overflow" portion at exactly the same height as your actual overflow. The sides are extended upwards by 10mm and you add a little horizontal portion over the box as a "roof". That would direct the water forward. Creating a lot of surface movement.

    Hopefully the following pictures will make it a bit clearer.

    Before cleaning up my silicone mess. You need to add the bulkhead first, as after completion of the box you cannot get to it anymore. The box is 20mm wide, leaving enough space in between the bulkhead and front panel for water to flow.
    [​IMG]

    Giving more an idea of water flow
    [​IMG]

    Cannot remember now which return pump were doing duty at the time that picture was taken. But that is a lot of flow. Might have been a 10000L/h DC.

    Giving more an idea of the size of the box. Here my son is pulling out tapwater leftovers from the freshwater wet test from the box.
    [​IMG]

    Box dimensions are 150 by 150mm. Inside the box its 20mm wide. The roof section is 35mm wide.

    Here is the same basic concept, on my Gandalf's TL550. OK the tank is lying on its back and upside down, still being worked on. So the return is at the bottom right. Here the front panel for both the overflow and return box are one piece of glass.
    [​IMG]

    You can add a piece of ABS sheet to the front of the box, to hide it a bit better. Extremely difficult to clean the silicone inside the box as you simply cannot get in there.
     
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  3. viper357

    viper357 Admin MASA Contributor

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    That's a clever idea, haven't seen anything like that before. Nice one.
     
  4. RiaanP

    RiaanP Thread Starter Moderator

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    Thank you viper357

    First time I used this design was March 2010
    [​IMG]

    Box in the right back corner.

    Was forced to come up with an idea. I bought that tank with holes already drilled. And the inlet was lower than the overflow box. Did try pipes inside to raise the return, but it just looked ugly. Alternative was to plug the hole with a small piece of glass and use an over the top return. Eventually decided to rather use the hole and put a box over it.
     
    Tokolosh 420 and viper357 like this.
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