Is a biofilter supposed to be outside the pond?

Discussion in 'DIY - Do It Yourself' started by Lumka, Jan 9, 2017.

  1. Lumka

    Lumka

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    Hi, I have a 1300 gallon pond, and I am planning to build a DIY biofilter. As I am searching the net - it seems that in all the designs the filter is outside the pond. Is there a reason for this? My plan is [was] to make a submersible filter, but now I have my doubts. Can someone please be so kind as to tell me what is wrong with my logic?

    What I plan is a tote box, sitting on the bottom, connected to my pump. Forgive my hand drawn diagram! I have a 2000g/h pump, and was planning to line the tote with filter sponges --> bioballs --> carbon.

    [​IMG]

    The reason I have for making it submersible is to hide the setup, and not have an eyesore outside.

    I would like any suggestions, please.
     
    Lumka, Jan 9, 2017
    #1
    Tula likes this.
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  2. Lumka

    Tula

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    My first pond had a similar type filter, an all in one box that rested on the bottom of the pond. It seemed to work ok, but it was not easy to remove and clean.

    I believe one reason the bio filters you see on line, are often outside the pond, is they require the presence of air. Lots of people make baki type showers and use them as water falls.
     
    Tula, Jan 10, 2017
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  3. Lumka

    Mmathis TurtleMommy

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    Like @Tula said, ease of cleaning and introduction of air.
     
    Mmathis, Jan 10, 2017
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    Meyer Jordan likes this.
  4. Lumka

    Meyer Jordan Tadpole

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    In addition to what has already be said, your biofilter design in itself does not allow for ease of maintenance. Activated Carbon in a biofilter can be quite beneficial in removing certain pollutants but effective lifespan is, at the most, a few weeks. At which time it will need to be completely replaced. Not easily done with your design.
     
    Meyer Jordan, Jan 10, 2017
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    CeeJayH, morewater and MitchM like this.
  5. Lumka

    morewater President, Raccoon Haters International

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    A tote box will weigh quite a bit when it is filled with soaked sponges and soaked carbon. Lifting this box out of the water in order to clean it will most likely result in it "bending" and spilling the contents out into the pond, thereby re-releasing the contaminants that you so diligently "collected" back into the water column.

    Any above-ground, below-ground or hybrid bio-filter construction needs to be of rigid material, be easy to drain and clean.

    Barrel bio-filters (40gal, 55gal) can easily be dug into the existing landscape to reduce their visual presence and can quite easily be disguised with stone and plant materials while still being relatively easy to service.

    Sponges, while they may work are an absolute pain-in-the-posterior to clean as they each have to be cleaned individually and tend to re-clog rather quickly. You're better off with a hard substrate such as bio-balls or some such other easily-cleaned material. Lava rock is in the same category, it's heavy, clogs up quickly and isn't easy to clean.

    Matala mats (when used in successively decreasing pore sizes) will trap the vast majority of the suspended detritus. Furnace filters, floor scrubbing pads, etc. are either too fine a mesh or too large a mesh. Do it once and do it right.

    If you're going to go the barrel route, ensure that the barrel is of "food grade" material meaning that it wasn't used originally to transport solvents, etc.

    A final thought, a "bottom up" design is more efficient than a "flow through" design. Gravity is your friend.
     
    morewater, Jan 10, 2017
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    CeeJayH, MitchM, Tula and 2 others like this.
  6. Lumka

    Lumka

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    Thanks all for the feedback! I especially like the comment: do it once and do it right. Appreciate it!
     
    Lumka, Jan 11, 2017
    #6
  7. Lumka

    Usman

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    welcome , use gravel if u want thats best underwater filter since water will go thru it easily and will not get clogged for long time as used in aquariums and you dont need to take it out to clean it , sponges are used mostly where it can be easily cleaned since its mesh is finer and will catch even the finest debris , it wil get blocked too quick to pass water properly
    i have read some where bio filter needs to be near the surface within a 10 inches to function at its fullest , may be u can place some hollow blocks below and raise it like a bog inside pond corner , i have seen submersible filters for polishing water as you want but they are made on smaller scale like in buckets that can be taken out
     
    Usman, Jan 17, 2017 at 5:42 PM
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    Lumka likes this.
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